Bash script to install environment variables globally

install-env-var.sh

#!/bin/bash

# example: sudo sh ./install-env-var.sh "FOO=bar" "BAR=foo"
for ARG in "$@"
do
	echo "*** installing environment variable: $ARG ***"
    export $ARG

    if ! grep -q "${ARG}" "$HOME/.profile"; then
        echo ${ARG} >> $HOME/.profile
    fi

    if ! grep -q "${ARG}" "/etc/environment"; then
        echo ${ARG} >> /etc/environment
    fi
done