idletime.sh

#!/bin/bash

# Teal Dulcet
# Outputs system idle time
# wget -qO - https://raw.github.com/tdulcet/Distributed-Computing-Scripts/master/idletime.sh | bash -s --
# ./idletime.sh

if [[ $# -ne 0 ]]; then
	echo "Usage: $0" >&2
	exit 1
fi

# Adapted from: https://github.com/tdulcet/Remote-Servers-Status/blob/master/status.sh
# getSecondsAsDigitalClock <seconds>
getSecondsAsDigitalClock() {
	local sec_num=$1
	local d=$((sec_num / 86400))
	local h=$(((sec_num % 86400) / 3600))
	local m=$(((sec_num % 3600) / 60))
	local s=$((sec_num % 60))
	local text=''
	if [[ $d -ne 0 ]]; then
		text+="$(printf "%'d" "$d") days "
	fi
	if [[ $d -ne 0 || $h -ne 0 ]]; then
		text+="$h hours "
	fi
	if [[ $d -ne 0 || $h -ne 0 || $m -ne 0 ]]; then
		text+="$m minutes "
	fi
	text+="$s seconds"
	echo "$text"
}

IDLETIME=$(awk '{ print int($2) }' /proc/uptime)
echo -e "System idle time for all processor (CPU) threads since the last boot:\t$(getSecondsAsDigitalClock "$IDLETIME")\n"