md5

#!/bin/bash


Help()
{
    echo 'Computes the md5 hash of a string.'
    echo
    echo 'Usage:'
    echo '  md5 -h'
    echo '  md5 string'
    echo
}

while getopts ":h" option; do
    case $option in
        h) #display help
            Help
            exit;;
    esac
done

echo -n $1 | md5sum -t | awk '{print $1}'

For Linux SysAdmns that handle MD5 (passwords, i.g.), as a safer alternative than online tools.
A good practice is to put it in the ~/.local/bin directory.