'The enjoyment of one's tools is an essential ingredient of successful work.' -- Donald E. Knuth

More is less johndcook.com/blog/2024/04/1…

diff3 compares three files line by line.

Error handling in bash scripts jtrocinski.com/posts/Bash-Err…

chmod +x marks a file as executable

Vim, a text editor for the ages thenewstack.io/a-look-at-vim-…

Editing a file without an editor johndcook.com/blog/2024/08/1…

Bash process substitution medium.com/@joewalnes/han… by @joewalnes

Shellcheck finds bugs in shell scripts shellcheck.net

sdiff shows diff output side-by-side.

A curl cheat sheet daniel.haxx.se/blog/2015/09/1…

Emacs turns 50
technologyreview.com/2026/10/20/114…

Flatten JSON files so they're easier to grep: github.com/TomNomNom/gron

Comparing regular expressions in Perl, Python, and Emacs johndcook.com/blog/regex-per…

Vim for Humans vimebook.com/en

You can find the dimensions of a png image using the file command, e.g. file foo.png.

Can install GNU versions of Unix utilities on Mac with homebrew: brew install coreutils

The ed line editor: bravado, utility, and history johndcook.com/blog/2023/12/1…

Help for each argument of a shell command: explainshell.com

List only subdirectories of the current directory: ls -d */

Avoiding multiprocessing errors in bash shell johndcook.com/blog/2024/02/1…