Bash - check dependencies

check_bash_script_dependencies.sh

#!/usr/bin/env bash

SCRIPT_DEPS="python terraform ssh-keygen ssh-add"

function die {
    echo $1 >&2
    exit 1
}

function missing_deps {
    die "Dying: Missing script dependencies: $SCRIPT_DEPS"
}

function check_dep {
    which $1 2>&1 > /dev/null
    [ $? -eq 0 ] || missing_deps
}