Bunch of functions to make things easier

processing.bash

#!/usr/bin/env bash

p () {
	declare USAGE="${FUNCNAME[0]} [-h] [-0] [--] [ARGS ...]"
	declare NL='\n'
	declare -i OPTIND=1
	while getopts h0 OPT; do
		case "$OPT" in
			'h')printf 'Usage: %s\n' "$USAGE";return;;
			'?')printf 'Usage: %s\n' "$USAGE">&2;return 1;;
			'0')NL='\0';;
		esac
	done
	shift $((OPTIND - 1))
	printf "%s$NL" "$@"
}

upper () {
	declare USAGE="${FUNCNAME[0]} [-h] [--]"
	declare -i OPTIND=1
	while getopts h OPT; do
		case "$OPT" in
			'h')printf 'Usage: %s\n' "$USAGE";return;;
			'?')printf 'Usage: %s\n' "$USAGE">&2;return 1;;
		esac
	done
	shift $((OPTIND - 1))
	tr '[:lower:]' '[:upper:]'
}

lower () {
	declare USAGE="${FUNCNAME[0]} [-h] [--]"
	declare -i OPTIND=1
	while getopts h OPT; do
		case "$OPT" in
			'h')printf 'Usage: %s\n' "$USAGE";return;;
			'?')printf 'Usage: %s\n' "$USAGE">&2;return 1;;
		esac
	done
	shift $((OPTIND - 1))
	tr '[:upper:]' '[:lower:]'
}

prefix () {
	declare USAGE="${FUNCNAME[0]} [-h] [-0] [--] [ARGS ...]"
	declare NL='\n'
	declare -a READARGS=()
	declare -i OPTIND=1
	while getopts h0 OPT; do
		case "$OPT" in
			'h')printf 'Usage: %s\n' "$USAGE";return;;
			'?')printf 'Usage: %s\n' "$USAGE">&2;return 1;;
			'0')NL='\0';READARGS=(-d $'\0');;
		esac
	done
	shift $((OPTIND - 1))
	while read -r "${READARGS[@]}"; do
		for A; do
			printf "%s$NL" "$A$REPLY"
		done
	done
}

suffix () {
	declare USAGE="${FUNCNAME[0]} [-h] [-0] [--] [ARGS ...]"
	declare NL='\n'
	declare -a READARGS=()
	declare -i OPTIND=1
	while getopts h0 OPT; do
		case "$OPT" in
			'h')printf 'Usage: %s\n' "$USAGE";return;;
			'?')printf 'Usage: %s\n' "$USAGE">&2;return 1;;
			'0')NL='\0';READARGS=(-d $'\0');;
		esac
	done
	shift $((OPTIND - 1))
	while read -r "${READARGS[@]}"; do
		for A; do
			printf "%s$NL" "$REPLY$A"
		done
	done
}