Comparing regular expressions in Perl, Python, and Emacs

Comparing the syntax features of regular expressions in Perl, Python, and Emacs. Several other languages mostly overlap with Python.

845

Unix tool tip · Oct 23, 2026 · 4:40 PM UTC

Vim for humans

3,146

Unix tool tip · Oct 22, 2026 · 4:40 PM UTC

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

2,644

Unix tool tip · Oct 21, 2026 · 4:40 PM UTC

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

2,741

Unix tool tip · Oct 20, 2026 · 4:40 PM UTC

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

Is using the ed line editor a way to show technical machismo, a practical way to get work done, or a historical curiosity. It's all three.

2,656

Unix tool tip · Oct 19, 2026 · 4:40 PM UTC

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

2,758