How to Create Digital Stamps for Free with Adobe Acrobat Reader and Stamp PDFs

Creating a free personal digital stamp with Adobe Acrobat Reader and applying it to a PDF approver field.

Managing Claude Code, Codex, and Gemini CLI with Homebrew and mise

To simplify setup across multiple Macs, I migrated Codex CLI and Gemini CLI to Homebrew and Claude Code to mise's install script.

[Mac App] Timer app 'Alinof Timer' is simple and easy to use

A short look at Alinof Timer, a simple Mac timer app I use to time internal meeting presentations.

Sleep Prevention Mac App 'Amphetamine'

Amphetamine, a macOS sleep-prevention app I use to bypass MDM-enforced sleep settings.

[Android] How to Configure Eclipse (Mac) Emulator to Connect to the Internet

Configuring the Android emulator's DNS in Eclipse on Mac to restore internet connectivity.

How to transfer files to Android 9 devices using Android File Transfer

Switching the Android 9 USB mode to File Transfer and sending files from macOS with Android File Transfer.

[Android/iOS] How to test Deep Link and Custom URL Scheme in development environment

Verify Deep Links and Custom URL Schemes locally with SimpleHTTPServer + ngrok, and open them on Android Emulator and iOS Simulator.

Android Studio installation for macOS

Installing Android Studio on macOS Mojave and clearing the SDK-license error.

How to set environment variables PATH and JAVA_HOME to use Android Studio's JDK in Terminal

Set PATH and JAVA_HOME to reuse Android Studio's bundled JDK from Terminal on macOS.

Managing Multiple Versions of Ansible with virtualenv

How to install multiple Ansible versions side by side using virtualenv and virtualenvwrapper on macOS.

Purchased 'Apple USB-C - 3.5 mm Headphone Jack Adapter MU7E2FE/A' to use wired earphones with MacBook Pro

A short note on buying Apple's USB-C to 3.5 mm headphone jack adapter for MacBook Pro.

Managing Multiple Go Versions with asdf

Installing and managing multiple Go versions on M1 macOS with the asdf-golang plugin.

How to Install asdf [macOS Edition]

Installing asdf on M1 macOS with Homebrew and wiring it into zsh via `.zshrc`.

Managing Multiple Java Versions with asdf

Managing Corretto 17 and 18 on M1 macOS with asdf-java, including JAVA_HOME setup.

Managing Multiple k6 Versions with asdf

Installing and managing multiple k6 load-testing versions on M1 macOS with the asdf-k6 plugin.

Managing Multiple Ruby Versions with asdf

Installing and managing multiple Ruby versions on M1 macOS with the asdf-ruby plugin.

Migrating from asdf to mise

A walkthrough of migrating from asdf to mise and removing direnv.

AWS Session Manager Plugin Installation Method [macOS Monterey 12.4 Edition]

Working install steps for the AWS Session Manager plugin on macOS Monterey 12.4.

Mac app 'Disk Speed Test' for HDD and SSD disk speed testing

Blackmagic Disk Speed Test — a free Mac App Store tool for benchmarking HDD and SSD read/write speeds.

[Mac] How to Fix brew Command Not Working in Yosemite

How to fix the brew command on Mac OS X Yosemite when it fails with a bad interpreter error.

How to fix 'fatal: cannot create directory at '.github': Permission denied' error with brew update

How to fix brew update's Permission denied error by chown-ing /usr/local and resetting the Homebrew repo.

[Mac] Fixing 'Error: /usr/local must be writable!' with brew update

Notes on recovering from brew update's /usr/local must be writable! error via chown and brew prune.

Solution for Brother HL-L2375DW Stuck on 'Printing-Looking for printer' Issue on macOS

Notes on fixing a Brother HL-L2375DW stuck at 'Printing-Looking for printer' on macOS with a simple restart.

Managing Multiple Bun Versions with asdf

Notes on managing multiple Bun versions with the asdf-bun plugin on M1 macOS.

How to Fix 'An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.' in bundle install

How to fix mysql2 gem's native extension build error by pointing bundler to openssl's ldflags.

[Ruby on Rails] Solution for 'An error occurred while installing pg (1.4.5), and Bundler cannot continue.' [macOS Edition]

How to fix pg gem install errors on macOS by installing libpq with Homebrew and updating PATH.

How to Fix 'This site can't be reached DNS_PROBE_FINISHED_NXDOMAIN' in Chrome Browser

Four things I tried on macOS Chrome to clear the DNS_PROBE_FINISHED_NXDOMAIN error.

[Coda] How to Set HAML/SASS Coloring (Syntax Highlighting)

Enable HAML and SASS syntax highlighting in the Coda editor by dropping mode files into the Coda Modes folder.

Colima + Docker CLI Setup Guide (macOS)

A practical guide to setting up a Colima + Docker CLI environment on macOS. Covers installation, basic operations, and resource configuration for this Docker Desktop alternative.

Notes on Cross-Platform Computer Use Agents for macOS and Windows — Selection with Hermes Agent and cua-driver as of September 2026

Notes from comparing Computer Use agents that can operate native apps on both macOS and Windows as of September 2026. Among official apps, only the ChatGPT and Claude desktop apps clear the bar of two-OS support plus full-OS control. On the open-source side, Nous Research's Hermes Agent paired with trycua's cua-driver is the strongest starting point, with UI-TARS, Agent S, and Open Interpreter as adjacent candidates. This article focuses on what feature-matrix comparisons tend to hide: the actual scope of the 'no-foreground contract' for background operation, TCC and Accessibility on macOS, UIPI and Session 0 on Windows, multi-monitor limits, and Japanese IME behavior.

[Mac] Connecting MacBooks and iMacs with LAN cables

Direct-connecting two iMacs with a LAN cable and letting DHCP assign IPs automatically.

Command to Convert Line Endings from CR+LF (Windows) to LF (Linux) [Linux, macOS Edition]

Batch convert CR+LF line endings to LF on Linux/macOS with a one-liner using the tr command.

[CotEditor] Use \1 to Reference Matched Values in Regular Expression Replacement

A note that CotEditor's regex replace uses \1 for captured backreferences instead of the more common $1.

How to create a US iTunes account

Notes on creating a US iTunes account from Japan, including reference article and Apple Store addresses to use.

How to Install dbt CLI [macOS Edition]

Installing dbt CLI on macOS via Homebrew and checking the version.

Dropbox CLI dbxcli Installation and Initial Setup [macOS Edition]

Installing dbxcli on macOS via Homebrew, logging in, and trying uploads from the CLI.

PDF File Difference Checking Tool: diff-pdf

Installing diff-pdf and using --view to visually compare two PDFs on macOS.

[Mac] DiffMerge - Advanced App for File Diff Comparison

SourceGear's DiffMerge as a step up from diff and FileMerge on Mac.

How to Manage Environment Variables with direnv

A walkthrough of managing per-directory environment variables with direnv, from install to direnv allow.

How to Install Docker Desktop on an Existing Docker CLI Environment (macOS Homebrew)

Learn how to resolve completion file conflicts when installing Docker Desktop on an environment with only Docker CLI, using the --force option.

Steps to build specific version Elasticsearch [Docker Edition]

How to run a specific Elasticsearch version on Docker, from docker run to curl verification.

MySQL Setup Procedure for Specific Version [Docker Edition]

How to run a specific MySQL version on Docker, including the GRANT tweaks Docker for Mac needs.

Steps to build specific version Redis server [Docker Edition]

How to run a specific Redis version on Docker and verify it via redis-cli INFO Server.

Notes for learning dotinstall's "Express Introduction" on Mac right now

Notes on stumbling points when following dotinstall's Express Introduction on Mac.

Notes for learning dotinstall's "Introduction to UNIX Commands (General User Edition)" on Mac

Notes on which lessons of dotinstall's UNIX Commands course to skip on Mac and which to work through.

[Mac] Installing Eclipse Kepler (4.3) on Mountain Lion + Japanese Localization

Installing Eclipse Kepler on Mountain Lion and localizing it to Japanese with Pleiades.

I Purchased ELECOM 'ZEROSHOCK Inner Bag' PC Case for MacBook

Why I picked the ELECOM ZEROSHOCK ZSB-IBN15BK inner bag for MacBook, with the slimmer ZSB-IBUB04BK as an alternative.

How to change PDF title with exiftool on CLI

How to rewrite a PDF's Title metadata from the CLI using exiftool.

Converting .mov to .gif with FFmpeg [macOS Edition]

Convert a .mov to a scaled 12fps .gif on macOS using FFmpeg for uploading to GitHub issues.

Converting MOV to MP4 with Resizing Using FFmpeg

A one-line FFmpeg command to convert .mov to .mp4 while resizing to 1280x720.

Converting mp3 to mp4 using FFmpeg to upload audio files to YouTube [macOS Edition]

Combine an mp3 and a jpg into an mp4 with FFmpeg on macOS for uploading audio to YouTube.

Enable CLI and Terminal auto-completion with Fig

Install Fig via Homebrew on macOS to add IDE-style autocompletion to your Terminal.

Uninstalling Fig and Installing zsh-autosuggestions

A walkthrough of switching from Fig to zsh-autosuggestions for terminal autocompletion.

fish shell Installation Steps [macOS Edition]

Installing fish shell on macOS via Homebrew and switching the login shell to fish.

fish shell Uninstallation Steps [macOS Edition]

Switching my macOS login shell back to zsh and uninstalling fish shell after hitting nvm compatibility issues.

Flutter Introduction | App Creation ~ Running on Android Emulator and iOS Simulator

A Flutter getting-started walkthrough — install, fix flutter doctor issues, and run on Android Emulator and iOS Simulator.

Free PostgreSQL GUI Tool 'Postico' is User-Friendly on macOS

We compared free PostgreSQL GUI tools available on macOS and summarized the features and user experience of each. Postico particularly felt user-friendly.

Installing geth (go-ethereum) and Connecting to Private Network [MacOS Edition]

Install geth on macOS via Homebrew and connect to an Ethereum private network.

How to Install GIMP [macOS Edition]

Installing GIMP on macOS with Homebrew Cask and launching it for the first time.

Root Cause and Permanent Solution for Permission denied Error on git commit in macOS

I suddenly encountered a Permission denied error when running git commit on macOS. While I introduced a workaround in a previous article, this time I was able to identify and solve the root cause, which I'll share with you here.

Causes and Workaround Solutions for git commit Permission denied on macOS

Getting `Permission denied` when trying to `git commit` on macOS...? Don't panic - let's isolate the cause and resolve it. This article introduces safe methods to fix the error, from checking Git hooks to macOS temporary directory issues.

[Git] diff-highlight: command not found Error

Symlink Homebrew Git's contrib/diff-highlight into your PATH to fix the command not found error.

How to Change File Names and Directory Names Case in Git

How to change the case of file and directory names in Git using git mv.

[Mac] Steps to install GMP with Homebrew

Install GMP, the arbitrary precision arithmetic library, on macOS with a single `brew install gmp`.

Go language version management tool gvm installation [macOS Edition]

Installing gvm on macOS and switching between specific golang versions.

A Quick Setup for Running hermes agent Locally — macOS, Ollama, and qwen3.6:35b for a Fully Local Stack

The shortest path to installing NousResearch's hermes agent on macOS and wiring it to qwen3.6:35b running locally under Ollama. No cloud API anywhere. It comes down to three steps: pull the model, install and run setup, and launch the TUI.

Notes on Enabling Hermes Agent Computer Use on macOS — Seven Snags Around /Applications and TCC Permissions

As a follow-up to the selection notes I wrote earlier, I actually enabled the Hermes Agent v0.21.1 computer_use toolset on a real macOS Tahoe (26.6) machine. The docs make it look like a single hermes computer-use install command, but the cua-driver macOS installer hard-codes .app placement in /Applications, the Mac is a Jamf-managed device where I started without admin rights, and TCC binds permissions to the driver's own bundle identity. Those pieces combined to trip me up seven times. This article writes each snag down with symptoms, causes, actual log output, and the resolution, so the next person setting this up has something to grep for.

How to Update Heroku Command (heroku-cli) to the Latest Version

Updating heroku-cli to the latest version with Homebrew on macOS to silence the update available notice.

Purchased PFU Keyboard HHKB Professional HYBRID Type-S English Layout / Charcoal

I picked up the PFU HHKB Professional HYBRID Type-S English layout (Charcoal) and paired it with multiple macOS machines.

Running HipChat, Slack, and Sqwiggle concurrently can kill you with memory shortage

Running HipChat, Slack, and Sqwiggle at the same time was rough on a MacBook Air with only 8 GB of memory.

[Homebrew] brew missing, imagemagick: xz

Resolving a brew doctor warning by installing the missing xz dependency required by ImageMagick.

[Homebrew] brew upgrade Warning: No developer tools installed. -> Run `xcode-select --install`

Resolving a 'No developer tools installed' warning from brew upgrade by running xcode-select --install.

[macOS] Code Management of Homebrew Installations with Brewfile

Managing Homebrew installations as code with a Brewfile to make Mac migration painless.

How to Update and Upgrade Homebrew

The difference between brew update and brew upgrade, and how to use each command.

How to Completely Erase macOS Disk

Standard macOS clean install plus a full-wipe path using diskutil secureErase from a bootable installer.

HTTrack - Tool for Saving Entire Websites - macOS Edition

How to install HTTrack on macOS via Homebrew and mirror a whole website for offline browsing.

After upgrading to Mac OS X El Capitan, hub command stopped working, but 'brew upgrade hub' fixed it

The hub command broke with ArgumentError after upgrading to El Capitan, and 'brew upgrade hub' fixed it.

Image compression sites and tools summary

A short roundup of JPEGmini for JPEG, TinyPNG for PNG, and ImageOptim for the Mac.

[Mac] Steps to install ImageMagick with Homebrew

A quick note on installing ImageMagick on macOS with a single Homebrew command.

How to Insert Images into PDFs on macOS

A short note on inserting images into PDFs on macOS with Adobe Acrobat DC.

How to install Ansible 2 on Mac

A quick note on installing the Ansible 2.x series on macOS with Homebrew.

[Mac] Installing chef and knife-solo

A short note on installing chef and knife-solo on macOS via gem install.

Steps to Install Diffusers on macOS

A installation guide for using Hugging Face's Diffusers library in macOS environment. Step-by-step instructions from setting up Python virtual environments to installing dependencies like PyTorch, Transformers, Accelerate, and Diffusers itself.

Steps to quickly install Elasticsearch on Mac with Homebrew

Install Java and Elasticsearch via Homebrew, start the service, and add the elasticsearch-head plugin.

How to Install Google Cloud SDK [macOS Edition]

Move the Google Cloud SDK tarball to your home directory, extract it, and run install.sh and gcloud init.

Installing iftop on Mac

After brew install iftop, the binary wasn't on PATH, so I symlinked it into /usr/local/bin/.

[Mac] Steps to install ionice command

Download ionice.c from GitHub, build it with gcc, and install it into /usr/local/bin/ to use ionice on Mac.

[Mac] Installing Nginx with Homebrew

brew install nginx on Mac and set it to auto-start via LaunchAgents with launchctl.

[Mac] Installing PHP5.4 with Homebrew

Tap josegonzalez/homebrew-php and install PHP 5.4 on Mac with fpm, intl, and pgsql options.

How to Install Python 3 on macOS High Sierra

Run brew install python3 on macOS High Sierra to get Python 3.7, then verify python3 and pip3.

[Git] Installation Steps for CUI Tool tig

brew install tig to get the Git CUI browser tig set up on Mac quickly.

How to Load Environment Variables from .env File in IntelliJ IDEA

Two ways to load environment variables from a .env file in IntelliJ IDEA — CLI launch and the EnvFile plugin.

Getting Currently Connected Network/Wi-Fi IP Address with ipconfig Command on Linux

Grab only the connected IP address on macOS with ipconfig getifaddr en0.

[iTerm] How to Set Window Background Transparency

Enable a translucent iTerm window from Preferences → Profiles → Window → Transparency.

Moving iTunes Media Folder to External Hard Drive

A note on relocating the iTunes Media folder to an external drive per Apple's official guide.

Lossless compression of JPEG images with Jpegoptim

Losslessly compress JPEGs on macOS with Jpegoptim from Homebrew, plus a one-liner for batching a whole directory.

jpegtran Command to Remove Metadata from jpeg and jpg Image Files

Strip Exif metadata from JPEGs with jpegtran on macOS, plus a find + -exec one-liner to batch a directory.

[Android] How to fix garbled characters in keytool command

Fix garbled keytool output on Mac by setting `_JAVA_OPTIONS` to UTF-8 file encoding.

Achieve Comfortable Video Calls with Noise Cancelling App Krisp

Using the Krisp noise-cancelling app to keep remote video calls clear from background noise.

[Linux/macOS] Batch Compress Files to .gz with gzip Command

Use gzip * to batch compress log files and free up disk space when hit with a sudden disk full incident.

[Linux] Using mktemp Command is Safe for Creating tmp Files

Use mktemp with mv or ln to safely create temporary files on Linux, and gmktemp on macOS for the same behavior.

[Linux] For deleting tab characters and spaces, tr command with -d option is simple and recommended

Use tr -d to strip tabs and spaces on Linux or macOS, plus a quick reference for tr's main options.

[Linux] How to Create Password-Protected ZIP Compressed Files

Use zip -er to build a password-protected archive from the command line on Linux or macOS.

[Mac] How to Set Up Android App Development Environment Using Eclipse

A memo on setting up an Android app development environment on Mac using Eclipse and the Android SDK.

[Mac] App for Recording Audio

A note on using the free GarageBand app to record audio on Mac.

[Mac] How to Configure ll Command to Execute ls -l Command

Adding an alias in `.bashrc` so `ll` works as `ls -l` on Mac.

For Batch Image Resizing on Mac, iMage Tools Free App is Recommended

Using the free iMage Tools app to batch-resize photos on macOS before blog uploads.

[Mac] Development Environment Setup Procedure Memo

A memo on setting up GCC, Homebrew, zsh, SSH, and gitconfig for a Mac development environment.

[Mac] How to Configure Not to Create .DS_Store Files

How to stop Mac from creating `.DS_Store` files on Windows network shares.

[Mac] How to fix slow Excel performance

Fixing slow Excel for Mac by cleaning up font duplicates, preference plists, and Microsoft caches.

[Mac] Finder Preferences Configuration Memo [2013 Edition]

A screenshot memo of my Mac Finder preferences configuration as of 2013.

[Mac] Completely Uninstall Elasticsearch Installed with Homebrew

Fully uninstalling a Homebrew-installed Elasticsearch, including its data and log directories.

[Mac] Essential Homebrew Packages to Install

A 2013 list of essential Homebrew packages to install on Mac.

[Mac] How to Install apple-gcc42 with Homebrew

How to install apple-gcc42 from the homebrew-dupes Formula and use the classic gcc-4.2 command on macOS.

[JavaScript] Installing SpiderMonkey on Mac with Homebrew

Installing SpiderMonkey with Homebrew so you can run JavaScript from the console via the js command.

[Mac] Installing OpenSSL with Homebrew

A memo on installing OpenSSL via Homebrew and using brew link --force to replace the macOS default.

[Mac] After Installing Homebrew, Got Error "Warning: Now install Xcode: http://developer.apple.com/technologies/xcode.html"

The 'Warning: Now install Xcode' Homebrew message was fixed by installing Xcode from the App Store.

[Mac] How to Fix When Hoster Won't Launch

Fixing Hoster launch issues by restoring the group and permissions on /etc/hosts.

[Mac] Installing MySQL with Homebrew

Installing MySQL via Homebrew on macOS, setting up auto-start, and logging in as root.

[Mac] Installing nkf with Homebrew

Installing the nkf character encoding converter on macOS with brew install nkf.

[Mac] How to Install Node.js and npm [Homebrew]

Installing Node.js via Homebrew and npm via the curl-based install.sh on macOS.

[Mac] Installing Redis with Homebrew

Installing Redis via Homebrew, setting up launchctl auto-start, and connecting with redis-cli.

[Mac] Installing tree Command with Homebrew

Installing the tree command on macOS via Homebrew to visualize directory structures.

[Mac] How to identify whether Intel CPU is 32-bit or 64-bit

Reference links for checking whether an Intel Mac has a 32-bit or 64-bit CPU.

[Mac] iTunes Migration Work

Migrating an iTunes library between Macs, with the reference article that helped.

[Mac][Lion] How to check kernel bit count and switch between 32/64bit

Checking the kernel bit count on Mac OS X Lion and switching between 32-bit and 64-bit.

[Mac] Command to check processes using a specific port: lsof -i

Using lsof -i on macOS to find the process listening on a specific port.

[Mac] "Magican" - An App to Find and Delete Unnecessary Files

Using the free Magican utility to clean up unnecessary files and free disk space on Mac.

[Mac] How to Configure PHP + Apache2 on Mountain Lion

How to enable the default PHP + Apache2 on Mountain Lion, with reference links for setting up MySQL or PostgreSQL.

[Mac] Error During Node.js Installation: Build failed: -> task failed (err #2): {task: uv uv.h -> uv.a}

Fixing a Node.js build failure around uv on macOS by removing osx-gcc-installer and keeping Xcode Command Line Tools.

Steps to Build Ruby Development Environment with RVM on Mac OS X Lion

Setting up Ruby 1.8.7 / 1.9.2 / 1.9.3 on Mac OS X Lion with RVM, from apple-gcc42 to default version selection.

[Mac] Solution for 'You do not have permission to open document xxx'

Fixing the 'You do not have permission to open document' error on Mac by batch-updating permissions with `chmod -R`.

[Mac] Steps for Screen Recording with QuickTime Player

How to record your Mac screen with QuickTime Player including microphone audio.

[Mac] Infected with virus and search-quick.com gets set as the default page

Cleaning a search-quick.com adware infection on a Mac using Safari extension cleanup and AdwareMedic.

[Mac] -bash: warning: setlocale: LC_CTYPE: cannot change locale (UTF-8): No such file or directory

Turn off Terminal's 'Set locale environment variables on startup' to silence the LC_CTYPE warning over ssh.

[Mac] How to Swap Control and CapsLock Keys on US Keyboard

Swapping Control and CapsLock on a Mac US keyboard from System Preferences → Keyboard → Modifier Keys.

[MacOS] System Preferences Configuration Memo [2013 Edition]

A 2013 snapshot of my Mac System Preferences, walked through by category with screenshots.

[Mac] How to Install wget

Installing wget on a Mac quickly via Homebrew.

[Mac] How to fix Wi-Fi (wireless LAN) connection issues

A reference-link memo for a Mac Wi-Fi troubleshooting guide that resolved my connection issue.

[Mac] Window Displaying Off-Screen Issue and Solution

Bringing a Mac window back from off-screen by deleting the app's plist under Preferences.

[Mac] zsh Installation Steps and Configuration Memo

Switching the default Mac shell from bash to zsh via Homebrew, then configuring oh-my-zsh.

Purchased『MacBook Pro 14 インチ 2021年モデル (M1 Pro / M1 Max) 用 マグネット式 プライバシーフィルター』

A quick note on getting a magnetic privacy filter for the 14-inch MacBook Pro (M1 Pro / M1 Max).

MacBook Pro 2018 (13 inch) PC case 'KIZUNA' purchase report

A purchase report on the KIZUNA PC case bag for the 13-inch MacBook Pro 2018.

macOS Copy-Paste Extension App Clipy

An introduction to the macOS copy-paste extension Clipy, and enabling its beta option to keep screenshots in the clipboard history.

[macOS] How to Input Control Characters [CotEditor Edition]

Insert control characters in CotEditor on macOS using its Unicode Hex input menu, with no system preferences changes.

[macOS] Divvy - An App to Change Window Size and Position with Keyboard Shortcuts

Configuring Divvy on macOS with a global launch shortcut and five window-placement shortcuts (left, right, up, down, full).

[macOS] How to Configure Finder to Show Hidden Files (Dot Files)

How to toggle hidden files (dot files) in macOS Finder with defaults write and killall Finder.

[macOS] Installing Homebrew (and Git While We're at It)

Installing Homebrew on macOS, verifying with brew doctor, and then installing Git through the package manager.

[MacOS] How to Uninstall All Versions of PostgreSQL ~ Homebrew Edition

Using brew uninstall --force to remove every Homebrew-installed PostgreSQL version on macOS, plus cleaning up the data directory.

macOS Initial Setup 2026 Edition

With a three-MacBook development setup, I had the chance to start from scratch. Here's my step-by-step workflow from Xcode Command Line Tools to a full Brewfile-based bulk install, documented as a work log.

macOS Keychain Error -25294 (errSecNoSuchKeychain) — Fixed by Importing the Certificate into login

You try to import a certificate into your keychain and get error -25294, which blocks the import. errSecNoSuchKeychain, meaning 'the specified keychain could not be found,' almost always points not at the certificate itself but at the destination keychain. Based on a case where switching the import target from Local Items to login fixed it, here is the cause and the shortest path to a fix.

How to Install Vim on Mac OS X Lion with Homebrew

Reinstalling Vim with +ruby on Mac OS X Lion via Homebrew, working around a libruby link error by switching to Ruby 1.8.7.

How to Uninstall MacPorts

Uninstalling MacPorts with sudo port -fp uninstall and cleaning up /opt/local and related directories.

[Mac] Memory cleaning apps are deprecated since OS X 10.9.x Mavericks

Why memory-cleaner apps are no longer recommended since OS X Mavericks, and how to check memory usage with Activity Monitor.

[macOS] Migrated memory cleaner from "Dr. Cleaner" to "Memory Cleaner"

Losing trust in Trend Micro and migrating from Dr. Cleaner to Nektony's Memory Cleaner on macOS.

macOS Monterey 12.4 System Preferences Memo [May 2022 version]

A personal, section-by-section memo of my macOS Monterey 12.4 System Preferences setup on a new MacBook Pro.

[MacOS] Steps to Install PostgreSQL with Homebrew

Installing PostgreSQL on macOS via Homebrew — initdb, launchd auto-start, PGDATA, and a non-superuser account.

macOS Password Reset Methods and Countermeasures

How Recovery Mode's resetpassword can be abused on a stolen Mac, and setting a firmware password as a countermeasure.

Steps to Build Ruby on Rails Development Environment on Mac [Ruby 1.8.7]

Setting up a Rails development environment on macOS with the system Ruby 1.8.7, RubyGems, Rails, and SQLite3.

[Mac] Installing Ruby and Rails with RVM

How to install Ruby and Rails on Mac with RVM, pulling in dependencies through Homebrew.

[macOS Sierra] Solution to Stop Showing 'Enter passphrase for key' Every Time

Adding UseKeychain and AddKeysToAgent to ~/.ssh/config stops macOS Sierra from asking for the SSH passphrase every time.

macOS System Preferences memo [2019 Edition]

The macOS System Preferences I revisit whenever I set up a new Mac, listed category by category.

[macOS] Terminal App Customization Settings

How I customize the macOS Terminal app — Pro profile, 95% opacity, Monaco font, and more.

Choosing a Language for MDM Script Distribution — Tradeoffs Across Bash and Go

Should an MDM script be Bash, a Swift binary, or a Go binary wrapped in a PKG? Signed binaries need notarization, and Windows wants PowerShell. This post lays out the practical tradeoffs across Bash / zsh, Swift, Go, and PowerShell so you can pick by workload, not by habit.

Issuing SSL Server Certificates for Local Environment with mkcert

Issuing SSL/TLS certificates for localhost with mkcert, from install to multi-domain certs.

[MongoDB] Error: failed to connect to [localhost:27017]

How a missing localhost entry in /etc/hosts broke a Node.js MongoDB connection on 27017.

[Mac] Installing MongoDB with Homebrew

Installing MongoDB with Homebrew on macOS and setting it up as a launchd auto-start service.

[MongoDB] How to start two instances on different ports (Mac / Homebrew)

Run two Homebrew MongoDB instances side by side on ports 27017 and 27018 with a second config.

Steps to build specific version MongoDB server [Docker Edition]

Run a specific MongoDB version locally with docker run, then verify from the mongo CLI.

[Mac] Merging videos with MPEG Streamclip

Merge videos on Mac using MPEG Streamclip via drag-and-drop and File → Save as.

Mac App 'Muzzle' That Can Turn Off Notifications During Video Calls is Super Convenient

Introducing Muzzle, a Mac app that silences notifications during video calls.

Change MySQL character encoding to UTF8

Steps to switch MySQL 5.7's character encoding to UTF8 via my.cnf.

[MySQL] How to configure my.cnf (Mac + Homebrew Edition)

How to configure my.cnf for MySQL installed with Homebrew on Mac.

ngrok Installation and Public URL Checking Methods [macOS Edition]

A quick guide to installing ngrok on macOS and checking the public URL in three ways.

[Node.js] Using node-wkhtmltopdf

How to install wkhtmltopdf via Homebrew so you can use node-wkhtmltopdf from Node.js.

[Node.js] How to Install Version Management Tool nodebrew on Mac

Installing the nodebrew Node.js version manager on Mac and troubleshooting the errors along the way.

[Node.js] How to Resolve Error: ENFILE: file table overflow, open xxx

Fixing Node.js's ENFILE: file table overflow on macOS by raising the file descriptor limit with launchctl plist files.

[Node.js] How to Install npm on Mac

Installing npm on a Mac that already has Node.js via nodebrew, and notes on the http URL gotcha.

Error: Cannot find module '../build/Release/sodium' solution [macOS Edition]

Fixing the Node.js 'Cannot find module sodium' error on macOS with Homebrew's libsodium and a fresh npm install.

[Node.js] How to Install the Version Management Tool nodebrew on Mac

Installing the Node.js version manager nodebrew on Mac, with fixes for build-time issues.

[Node.js] How to Install the Version Management Tool nvm on Mac

A quick memo on installing the Node.js version manager nvm on Mac.

[Ruby] How to Install Nokogiri [Mac Version]

Installing Nokogiri on Mac with Homebrew's libxml2/libxslt and a source-built libiconv.

[Ruby] "libiconv is missing" Error During nokogiri Installation with bundle install

Fixing the 'libiconv is missing' error during bundle install of nokogiri with bundle config build.nokogiri.

[Ruby] WARNING: Nokogiri was built against LibXML version 2.7.3, but has dynamically loaded 2.7.8

Fixing the Nokogiri vs LibXML version mismatch warning by reinstalling libxml2 libraries via Homebrew.

How to resolve node-gyp errors during npm install

Four ways I've fixed recurring node-gyp rebuild errors during npm install.

[Mac] NTT Flets Hikari Connection Setup Method

A memo of the reference link I used to set up NTT Flets Hikari PPPoE on Mac.

How to Fix OBS Studio 'Failed to Connect to Server' Error

Fixing OBS Studio's "Failed to connect to server" error via update and Bind to IP change.

[oh-my-zsh] How to Fix 'Insecure completion-dependent directories detected'

Resolving oh-my-zsh's Insecure completion-dependent directories warning with chmod 755.

[Zsh] oh-my-zsh Installation and Configuration Method

Installing oh-my-zsh, enabling plugins and custom configs, and dodging the PATH pitfall.

Solution for oh-my-zsh 'The `osx` plugin is deprecated and has been renamed to `macos`'

Fixing the oh-my-zsh warning about the deprecated osx plugin by renaming it to macos in .zshrc.

OpenVPN User Creation and VPN Connection Method [macOS Edition]

Creating an OpenVPN user and making a first VPN connection from macOS using OpenVPN Connect v3.

Lossless compression of PNG images with OptiPNG

Using OptiPNG on macOS to losslessly compress PNGs, individually or in a batch.

pdftoppm Command for Batch Converting PDF to Image Files on macOS

Batch converting PDF files to jpeg or png on macOS with pdftoppm, plus installing poppler via Homebrew.

[PHP] Installing PEAR and PHPUnit on Mac

Installing PEAR and PHPUnit on Mac OS X Mountain Lion.

How to Install PlantUML in VSCode (macOS Edition)

Installing the PlantUML extension in VSCode on macOS, with openjdk and graphviz via Homebrew.

[Ruby] Development HTTP Server 'Pow' by 37signals

Using 37signals' Pow — a zero-config Rack dev server for macOS — with Rails and Sinatra apps.

Switched prezto theme from pure to cloud after pure was removed

Switching prezto's prompt theme from pure to cloud after pure was dropped from the bundled themes.

Zsh Framework prezto Installation and Configuration

Installing prezto and setting the pure theme plus useful modules in `~/.zpreztorc`.

Got Library not loaded: libreadline error when running psql, so I ran brew upgrade postgresql

How I fixed a psql libreadline error with brew upgrade postgresql and pg_upgrade.

[macOS] Random String Generation Command for Passwords: pwgen

Installing and using pwgen on macOS to generate random password strings, including symbol characters.

[Python] How to Run Programs from Mac Terminal

Running a Python script from the macOS terminal by cd'ing to its directory and typing `python test.py`.

How to Easily Start a Web Server with macOS + Python

Quickly serving files from macOS with `python3 -m http.server 8000` (or the python2 equivalent).

Managing Multiple Python Versions with asdf

Setting up multi-version Python management on M1 macOS with the asdf-python plugin.

Remove Password from PDF Files with qpdf Command

Remove passwords and print restrictions from PDFs from the CLI using the open-source qpdf command.

QR Code Generation Command: qrencode

Install the qrencode command and generate QR codes safely from the CLI on CentOS, macOS, or Ubuntu.

Solution for rbenv/x.x.x/libexec/rbenv: No such file or directory

Fixing the rbenv/x.x.x/libexec/rbenv: No such file or directory error by running rbenv rehash.

[macOS] Rectangle App for Window Management with Keyboard Shortcuts

Rectangle lets you split and resize macOS windows with keyboard shortcuts — install via Homebrew in one command.

Solution for bundle/gem install rmagick error: Can't find MagickWand.h

Fixed the rmagick MagickWand.h build error by switching to Homebrew's imagemagick@6.

[Ruby] Solution for ERROR: cannot discover where libxml2 is located on your system. please make sure `pkg-config` is installed.

Fixing nokogiri's libxml2/pkg-config install error on macOS by installing the libraries with Homebrew and using system-libraries.

[RVM] Empty path passed to certificates update, functions stack: requirements_osx_update_openssl_cert_run …

Fixing an RVM Ruby 2.1.3 install error by reinstalling with the --disable-binary flag.

[RVM][Mac] Error running 'make ', please read ruby-1.9.2-p290/make.log

Working around a Ruby 1.9.2 make error on Mac OS X Lion by installing apple-gcc42 and using CC=gcc-4.2.

[RVM][Ruby] ERROR: Loading command: install (LoadError) cannot load such file -- zlib, ERROR: While executing gem ... (NameError) uninitialized constant Gem::Commands::InstallCommand

Fixing a zlib LoadError from gem install by reinstalling Ruby 1.9.3 with RVM without the -C path options.

[RVM] How to resolve Could not load OpenSSL error

Fixing a Could not load OpenSSL error in RVM-managed Ruby by installing OpenSSL via rvm pkg.

[Ruby] How to Configure RVM Ruby Version for Default Use

Using rvm use --default to make an RVM-installed Ruby the default in every new terminal session.

[Mac] Setup Method for Using Sakura VPS VNC Console on Mountain Lion

To use the Sakura VPS VNC console on Mountain Lion, revert Java from 7 back to Java 6.

MacBook Pro 2018 compatible 'Satechi Thunderbolt 3 (USB-C) Multi Hub' purchase report

A photo unboxing report of the Satechi Thunderbolt 3 (USB-C) Multi Hub, purchased for a MacBook Pro 2018.

Seashore Stopped Launching on macOS Sierra

A memo on Seashore no longer launching on macOS Sierra, and switching over to Pixelmator instead.

Shell Script to Open GitHub Issues Updated in the Last n Hours in Browser

A shell script that queries `gh issue list` and batch-opens recently updated GitHub issues in the macOS browser.

How to Install Shopify CLI and Theme on macOS

Install Shopify CLI and @shopify/theme on macOS via asdf-managed Node.js and npm, skipping Homebrew.

WARNING: UNPROTECTED PRIVATE KEY FILE When Copying SSH Public/Private Key Files

How I cleared the `WARNING: UNPROTECTED PRIVATE KEY FILE` error by tightening private key permissions with `chmod 600`.

[Mac] How to Configure Sublime Text for Command Line Use

Enabling the subl command on macOS by symlinking Sublime Text's helper into /usr/local/bin.

[Mac] terminal-notifier is convenient for notifying when Terminal commands complete!

How to install and use terminal-notifier to get Mac notifications when long Terminal commands finish.

Japanese Text Recognition from Images Using Tesseract OCR [macOS Edition]

Install Tesseract OCR on macOS, add the Japanese trained model, and recognize Japanese text from images.

Resolved tfenv install Error with brew install grep

Fixing a `tfenv install` error caused by missing GNU Grep with `brew install grep` on macOS.

Introduction to Terraform Version Management Tool tfenv [macOS Edition]

Getting started with tfenv on macOS to manage multiple Terraform versions across projects.

Titanium Mobile Introduction (Titanium Studio Installation/Configuration ~ Running on iPhone/Android Simulator)

Setting up Titanium Studio and getting a first project running on iPhone and Android simulators.

Trello Mac App is Fast and Comfortable, So I Switched from the Web App

The Trello Mac app is fast and comfortable, so a Trello heavy user switched from the web app.

Download Twitter Spaces Audio Files with twspace-dl

Installing and running the Python CLI twspace-dl on macOS to download Twitter Spaces audio.

Commands to Check, Add, and Remove UTF-8 BOM <U+FEFF> [Linux, macOS Edition]

Using the file and nkf commands to check, add, and remove the UTF-8 BOM on Linux and macOS.

[Virtual OS] Installing CentOS on VirtualBox as a Development Server [Mac OS X (Snow Leopard)]

A memo on installing CentOS 5.6 on VirtualBox as a dev server on Mac OS X Snow Leopard.

[VirtualBox] Installing Guest Additions for Screen Size Changes

Installing VirtualBox Guest Additions on Windows 7 to enable screen size changes.

Installed VLC Due to QuickTime Freezing Bug on macOS 14 Sonoma

Working around QuickTime freezes on macOS 14 Sonoma by installing VLC via Homebrew Cask.

[VMware Fusion] How to Add Windows Applications to Mac Application Folder

Adding Windows 7 apps to the Mac Applications folder from VMware Fusion 5.

[VSCode] How to Prevent Tab Overwriting When Opening Files

Stop VSCode from overwriting an existing tab every time you open a file.

Fixing whois Command Character Corruption with nkf [macOS]

Pipe whois through nkf to fix garbled Japanese output on macOS.

How to Test Windows 10 + Internet Explorer 11 on macOS [VirtualBox Edition]

Set up a Windows 10 + IE11 testing VM on macOS with VirtualBox.

How to use Windows on Mac for free (IE, Edge only)

Set up IE and Edge testing on a Mac for free using VirtualBox and ievms.

[Windows10] L2TP/IPSec VPN client connection setup

Reference notes for L2TP/IPSec VPN client setup on Windows 10, including a Mac VPN Server tweak.

[macOS] dyld: Library not loaded: /usr/local/lib/QtWebKit.framework/Versions/4/QtWebKit

Fixing the wkhtmltopdf QtWebKit dyld error on macOS High Sierra with a Homebrew Cask reinstall.

[Mac] GNU GCC 4.2 is Not Supported from Xcode 4.2

A note that Xcode 4.2 dropped GNU GCC 4.2 support, leaving only LLVM-based compilers.

[Mac] How to Downgrade from Xcode 4.2 to 4.1

Downgrading Xcode 4.2 to 4.1 on Mac OS X Lion to work around an rvm warning while installing Ruby 1.9.2.

Mac App 'ZIPANG' for Extracting and Compressing ZIP Files Without Character Corruption

ZIPANG is a Mac app that fixes ZIP filename mojibake between macOS and Windows by converting encodings on compress/extract.

How to Fix the Issue When 'Sign in with Google' Doesn't Appear in Zoom

How I brought back the missing 'Sign in with Google' button in the Zoom Mac app by reinstalling and restarting.