Editing Comma command

A while ago, someone on HN or Lobste.rs suggested the idea of having your custom commands be prefixed by a <code>,</code> and I started doing that a while ago.

The comma-prefixed list of commands is empty. There's no standard command that does this, so it's an easy way to get autocomplete for your local commands. Also, you can just use one or two characters and not interfere with other things.

Sometimes, I use these [[Blog/2024-02-28/Rust Panamax|instead of aliases]] and other times just for short scripts. Many of these are cobbled together from other sources.

I usually store them in <code>~/bin</code> and make sure that directory is in my <code>PATH</code> and then that's it!

== <code>,dehex</code> ==

Used to convert hex characters into their ASCII text values.

Use as: <code>echo "6162636465660a" | ,dehex</code>

<syntaxhighlight lang=bash>
#!/usr/bin/env bash

echo "$1" | xxd -r -p
</syntaxhighlight>

== <code>,ht</code> ==

Used to highlight one or two words. Sometimes I want to <code>grep</code> for something and then I want to highlight a few characters.

Use as: <code>echo "words I care about" | ,ht words care</code>

<syntaxhighlight lang=bash>
#!/usr/bin/env bash

highlight() {
  # Foreground:
  # 30:black, 31:red, 32:green, 33:yellow, 34:blue, 35:magenta, 36:cyan

  # Background:
  # 40:black, 41:red, 42:green, 43:yellow, 44:blue, 45:magenta, 46:cyan
  escape=$(printf '\033')
  sed "s,$2,${escape}[$1m&${escape}[0m,g"
}

if [[ $# == 1 ]]; then
  highlight 31 $1
elif [[ $# == 2 ]]; then
  highlight 31 $1 | highlight 32 $2
elif [[ $# == 3 ]]; then
  highlight 31 $1 | highlight 32 $2 | highlight 35 $3
elif [[ $# == 4 ]]; then
  highlight 31 $1 | highlight 32 $2 | highlight 35 $3 | highlight 36 $4
fi
</syntaxhighlight>