clunky-usage.bash

#!/usr/bin/env bash

usage() {
  cat << EOF
usage: $0 [options] <argv>...
 
Options:
  -h        Show help options.
  -v        Print version info.
EOF
}

explain.bash

help=$(grep "^## " "${BASH_SOURCE[0]}" | cut -c 4-)

usage-example.bash

#!/usr/bin/env bash

#- usage-example 1.0
#- Copyright (C) 2013 Thomas Rampelberg

## Usage: usage-example [options] <argv>...
##
##       -h     Show help options.
##       -v     Print version info.

help=$(grep "^## " "${BASH_SOURCE[0]}" | cut -c 4-)
version=$(grep "^#- "  "${BASH_SOURCE[0]}" | cut -c 4-)

opt_h() {
  echo "$help"
}

opt_v() {
  echo "$version"
}

while getopts "hv" opt; do
  eval "opt_$opt"
done