Filter/Modify contents of the macOS pasteboard using arbitrary commands

pbmunge.bash

function pbmunge {

  if [[ "$1" ]] && echo "$1" | grep -q -e '^-h$' -e '^--help$'
  then
    echo 'Usage: pbmunge utility [util-arg ...]'
    echo ''
    echo "Filter (or munge) contents of the macOS pasteboard using \`utility'"
    echo "    \`utility' will be invoked with any supplied util-arg(s)"
    echo ''
    echo 'Example: increase the quote level of a plain text email'
    echo "\$ pbmunge sed -e 's/^/> /g'"

    return 0
  fi

  if [[ $# -eq 0 ]]
  then
    echo 'pbmunge: error! expected at least one argument' 1>&2
    return 1
  fi

  pbpaste | "$@" | pbcopy
}