Shell Programming and Scripting

localping 1-20
Pinging 192.168.10.1... is up
Pinging 192.168.10.2... is down

#!/bin/bash
#
#	Variables
#
	[ -z "$1" ] && echo "Usage: ${0##*/} 15 30-37 42 .."
	TMP=~/.cache/tmp.$$
#
# 	Prepare Base IP
#
	# IPv6? -- dont work, not needed, but fun anyway.
	[ "-6" = "$1" ] && \
		filter=6 && \
		shift || filter=" "
	# Get Ip
	ip addr|grep inet"$filter" |grep -ve 127 -ve " ::"|awk '{print $2}' > $TMP
	while IFS="." read A B C igno; do IP_PRE="$A.$B.$C"; done<$TMP
#
#	Ping arguments
#
	for num in "${@}";do	# Parse all the arguments
		# Its a range, as it contains a '-'
		if [ "-" = "$(echo $num|tr -d [[:digit:]])" ]
		then	# So lets get the start and end range
			range_start=${num/-*}
			range_end=${num/*-}
			# Lets fil lthe variable with the range of IP's
			range=$(seq $range_start 1 $range_end)
		else	# It has no range, its a single number
			range=$num
		fi

		# Parse all the numbers of range, and use them for the ping command
		for r in $range;do
			# Let the user know what we're doing now...
			printf "%s" "Pinging $IP_PRE.$r... "
			# Execute the command and append the missing text according to exit status
			ping -c 1 $IP_PRE.$r 2>/dev/zero  1>/dev/zero  && \
				echo "is up" || \
				echo "is down"
		done
	done
#
#	Cleanup
#
	rm -f $TMP

IP_PRE=$(ip addr | awk -vFLT=" " '/ 127\./ {next} $0 ~ "inet" FLT {sub (/[^.]*$/, "", $2); print $2}')

for r in $(for i; do [[ "$i" =~ "-" ]] && echo -n "$(seq -s" " ${i/-/ 1 }) " || echo -n "$i "; done)
   do ...