bash script skeleton following https://github.com/progrium/bashstyle

README.md

To start a new script use this one-liner:

curl -Lo newscript.sh http://j.mp/bash-skeleton

run.sh

#!/usr/bin/env bash

debug() {
    if ((DEBUG)); then
       echo "===> [${FUNCNAME[1]}] $*" 1>&2
    fi
}

list-commands() {
  echo "available commands:"
  sed -n 's/\(.*\)().*/  ::\1/p' ${BASH_SOURCE} \
   | grep -v 'main\|debug\|sed\|list-commands' \
   | sort
}

main() {
  # if last arg is -d sets DEBUG
  [[ ${@:$#} == -d ]] && { set -- "${@:1:$(($#-1))}" ; DEBUG=1 ; } || :

  if [[ $1 =~ :: ]]; then 
    debug DIRECT-COMMAND  ...
    command=${1#::}
    shift
    $command "$@"
  else 
    debug default-command
    list-commands
  fi 
}

alias r=". $BASH_SOURCE"
[[ "$0" == "$BASH_SOURCE" ]] && main "$@" || true

script-sceleton.sh

#!/bin/bash

set -eo pipefail
if [[ "$TRACE" ]]; then
    : ${START_TIME:=$(date +%s)}
    export START_TIME
    export PS4='+ [TRACE $BASH_SOURCE:$LINENO][ellapsed: $(( $(date +%s) -  $START_TIME ))] '
    set -x
fi

debug() {
  [[ "$DEBUG" ]] && echo "-----> $*" 1>&2
}

main() {
  : ${DEBUG:=1}
}

[[ "$0" == "$BASH_SOURCE" ]] && main "$@" || true