ruptime

#!/usr/bin/env bash
# ruptime -- collect uptime information from multiple hosts
#
# Inspired by the RPC-based 'rup' from SunOS 4 manual.

. lib.bash || exit

usage() {
	echo "Usage: $progname [-H HOSTS] [-S] [-d|-m]"
	echo
	echo_opt "-H HOSTS"	"list of hosts to query"
	echo_opt "-S"		"connect as superuser (root)"
	echo_opt "-d"		"query root filesystem usage"
	echo_opt "-m"		"query memory usage"
}

hosts=
user=
what=kernel

while getopts ":H:Sdm" OPT; do
	case $OPT in
	H) hosts=${OPTARG//,/ };;
	S) user=root@;;
	d) what=disk;;
	m) what=mem;;
	*) lib:die_getopts;;
	esac
done; shift $((OPTIND-1))

if (( $# )); then
	die "Unrecognized arguments '$*'"
fi

hosts=$(rlisthosts "$hosts") || exit

getdata() {
	local user=$1
	local hosts=$2
	local cmd=$3
	(for host in $hosts; do
		ssh $user$host "$cmd" &
	done; wait)
}

case $what in
	kernel)
		cmd='printf "%s\t%s\t%s\t%s\t%s\n" \
			"$(hostname)" \
			"$(uname -r)" \
			"$(uptime | sed -E "s/.* up ([0-9]+ days).*/\1/")" \
			"$(uptime | sed -E "s/.*load average: //")" \
		'
		getdata "$user" "$hosts" "$cmd" | sort -V -k 2,1 | column -s $'\t' -t \
			--table-columns "HOST,KERNEL,UPTIME,LOADAVG"
		;;
	mem)
		cmd='printf "%s\t%s\t%s\t%s\t%s\n" \
			"$(hostname)" \
			"$(free -b | awk "/^Mem:/{printf \"%.0f%%\", \$3*100/\$2}")" \
			"$(free -b | awk "/^Mem:/{print \$7}" | numfmt --to=iec)" \
			"$(free -b | awk "/^Mem:/{print \$2}" | numfmt --to=iec)" \
		'
		getdata "$user" "$hosts" "$cmd" | sort | column -s $'\t' -t \
			--table-columns "HOST,MEM USE,MEM FREE,MEM TOTAL" \
			--table-right "MEM USE,MEM FREE,MEM TOTAL"
		;;
	disk)
		cmd='printf "%s\t%s\t%s\t%s\n" \
			"$(hostname)" \
			"$(df -h / | awk "NR==2{print \$5}")" \
			"$(df -h / | awk "NR==2{print \$4}")" \
			"$(df -h / | awk "NR==2{print \$2}")" \
		'
		getdata "$user" "$hosts" "$cmd" | sort | column -s $'\t' -t \
			--table-columns "HOST,DISK USE,DISK FREE,DISK TOTAL" \
			--table-right "DISK USE,DISK FREE,DISK TOTAL"
		;;
esac