CODEWITHSUNDEEP
shell
user1623723
user1623723

Reputation: 1

Adding conditional clause to simple ping script

I have a handy dandy shell script that cycles through a list of IP addresses and echoes out the percentage of packet loss (below).

I'd love to weave in an if/then statement to only echo out results if the percent does NOT equal 0.0%.

Your suggestions most appreciated!

#!/bin/bash
HOSTS="192.168.99.24 192.168.99.23"
COUNT=10
SIZE=1400
for myHost in $HOSTS
do

   ping -q -n -s $SIZE -c $COUNT $myHost | awk -v host=$myHost '/packet loss/ {print host, $7}'

done

Upvotes: 0

Views: 215

Answers (2)

GreyCat
GreyCat

Reputation: 17104

If you just want to check a list of hosts if each host is alive or not, then I'd suggest to ditch using ping at all for this purpose and use fping, which is much better scriptable than regular ping and solves this problem in one-liner:

$ fping -q -c $COUNT -b $SIZE $HOSTS | grep ': xmt' | grep -v '%loss = .*/0%'
192.168.1.2 : xmt/rcv/%loss = 12/0/100%
192.168.1.3 : xmt/rcv/%loss = 12/0/100%
192.168.1.4 : xmt/rcv/%loss = 12/0/100%

Invocations of grep here are used to (1) grep only for resulting lines, (2) remove unwanted lines with 0% loss which look like this:

192.168.1.1 : xmt/rcv/%loss = 12/12/0%, min/avg/max = 1.08/1.11/1.19

fping scales really well up to millions of hosts and can be used to ping a list of hosts in a file:

fping -q -c $COUNT -b $SIZE -f <host-list.txt | grep ': xmt' | grep -v '%loss = .*/0%'

Upvotes: 0

chepner
chepner

Reputation: 530872

I'm assuming $7 is the percentage (it's $6 for me). Just put an extra condition in your awk script.

awk -v host=$myHost '/packet loss/ && $7!="0%" {print host, $7}'

Upvotes: 1

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