"tcpdump" command in "crontab" crashes immediately after running the "crontab" jobs

Asked Jan 03 '23 at 03:44

Active Jan 03 '23 at 10:16

Viewed 170 times

I want crontab to start a tcpdump command, but tcpdump seems to crash immediately after running the crontab jobs. This is the command that I am trying to run:

@reboot  /usr/sbin/tcpdump -l enpls0 -G 3600 -tttt -vvv 'port 5000' -w /home/edward/dump-%H.pcap

What am I doing wrong?

edited Jan 03 '23 at 10:16

BeastOfCaerbannog

14,585

asked Jan 03 '23 at 03:44

Zion T

It may not be the only issue, but you will need to escape the % in the filename in order for the %H to be processed as a timespec for the -G 3600 file rotation option. See for example Command with percent symbols not running in crontab. – steeldriver Jan 03 '23 at 14:10
https://stackoverflow.com/questions/74319531/why-is-crontab-not-starting-my-tcpdump-bash-script-capture Check out the link. Hopefully, some of those suggestions will help. Try to update the script. – Ringer23 Jan 03 '23 at 07:25
2

Does this answer your question? Command with percent symbols not running in crontab – karel Jan 10 '23 at 07:36

"tcpdump" command in "crontab" crashes immediately after running the "crontab" jobs

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