#!/bin/bash

# Variables
sudo=sudo
renice=renice
pid="$(pidof "$1")"

# Error function
error() {
	>&2 echo -e "\033[1;31mERROR:\033[0m $1"; shift
	exit "${1:-1}"
}

# Test if process exists
if [[ -z $pid ]]; then
	error "No such process." 1
else
	shift
fi

# Arguments
prio="${1:--20}"; shift

# Command building
renice=(
	"$sudo"
	"$renice"
	"$prio"
	"$pid"
)

# Debug
#echo "${renice[@]}"
#exit 0

# Execution
"${renice[@]}"