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#!/bin/bash
###
### my-script — does one thing well
###
### Usage:
### my-script <input> <output>
###
### Options:
### <input> Input file to read.
### <output> Output file to write. Use '-' for stdout.
### -h Show this message.
help() {
sed -rn 's/^### ?//;T;p' "$0"
}
if [[ $# == 0 ]] || [[ "$1" == "-h" ]]; then
help
exit 1
fi
echo Hello World
@snejus
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snejus commented Oct 15, 2020

Why even use the extended version?

sed -n 's/^###//p' achieves the same. Just keep the leading ### format to the help only.

sed -n '/^###/ s///p' this one's faster but a tiny bit more verbose.

and sed '/^###/!d' if you don't mind hashes. Or grep "^###"

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