RGB Colors in Bash

rgb.bash

#!/bin/bash
# https://en.wikipedia.org/wiki/ANSI_escape_code#Colors

# Control Sequence Introducer
# https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_(Control_Sequence_Introducer)_sequences
function csi() {
	ESC="\033"
	parameters=$(echo $@ | sed -e 's/ /;/g')
	echo "$ESC[${parameters}m"
}

function text_effect() {
	RESET="0"
	first_arg=$(echo "$@" | cut -d ' ' -f 1)
	rest_of_args=$(echo "$@" | cut -d ' ' -f 2-)
	echo "$(csi $rest_of_args)$first_arg$(csi $RESET)"
}

function red() {
	RED_FG="31"
	echo -e $(text_effect $1 $RED_FG)
}

function green() {
	GREEN_FG="32"
	echo -e $(text_effect $1 $GREEN_FG)
}

function blue() {
	BLUE_FG="34"
	echo -e $(text_effect $1 $BLUE_FG)
}

red $1
green $1
blue $1