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Use @ Magic with Bash Parameter Expansion

TIL that you can use all the wonderful parameter expansion stuff on each item of an array if use the @ sign in your parameter expansion (and nothing else).

#!/usr/bin/bash

commands=(foo bar help usage)

join() {
  delim="$1"
  first="$2"
  shift 2
  printf "%s" "$first" "${@/#/$delim}"
}

join '|' ${commands[@]}

Which will print:

foo|bar|help|usage

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