Bash shell function to verify md5sum

md5sum.sh

#!/bin/env bash

function md5sum {
    md5 "$1" | cut -f2 -d'=' | tr -cd "[:alnum:]"
}

function md5sum.verify {
    if [[ ( -f "$1" ) || ( ! -f "$2" ) || ( $(echo "$1") == "" ) ]] ; then
      echo 'usage: md5sum.verify checksum filename';
    else 
      diff <(echo -n "$1") <(md5sum "$2") -q
    fi
}