CODEWITHSUNDEEP
bashloggingstdoutpingstderr
nilosch
nilosch

Reputation: 162

Hide statistics of ping command. (Server monitoring script)

I want to write a bash script that monitors the status of my server.

Currently I have the following line to log the ping:

ping -c 1 google.com | grep -A 1 "bytes from" | xargs -L 1 -I '{}' date '+"%F %T" {}' >> ping.log

Unfortunately the grep filter also filters out error messages, but I only want to remove tthe first line and the summary.

"2020-12-04 15:46:00" 64 bytes from 216.58.208.110 (216.58.208.110): icmp_seq=1 ttl=37 time=16.2 ms
"2020-12-04 15:47:00" Request Timed Out.

Is there another way to supress only the ping summary, so that error messages are also added to my log?

Upvotes: 0

Views: 1337

Answers (2)

irdroid3
irdroid3

Reputation: 69

I am sure there is something weird about ping and stderr, as I have been trying to suppress ALL messages (as I use the return code to do other processing). I do this, as ANY messages from a cron task cause root mail, which, although fine to catch problems, is not how I want to catch a ping failure.

I have had these results :

ping -q -c 3 ians.guess-fail.com 2>&1 >/tmp/ping.txt
ping: ians.guess-fail.com: Name or service not known

ping -q -c 3 ians.guess-fail.com 2>&1 >/dev/null
ping: ians.guess-fail.com: Name or service not known

ping -q -c 3 ians.guess-fail.com 2>/dev/null >/tmp/ping.txt
# No output/messages produced!!!

I have no idea why... But I will use that last example.

Upvotes: 1

Raman Sailopal
Raman Sailopal

Reputation: 12887

Try using awk (in this case GNU awk) and so:

ping -c 1 www.google.co.uk | awk '/^---/ { exit } NR > 1 && !/^$/ { print strftime("%F %T")" "$0 }'

Take the ping output and print only the second line, lines that are not blank and then exit once we get to the start of the summary (starts with ---). For all other lines, print the line prefixed with the date, built with awk's strftime function.

Upvotes: 1

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