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When someone is not in the sudoers group and try to use sudo, get an error message like this one:

yzT is not in the sudoers file. This incident will be reported.

I'm trying to figure out in which log this information is logged, for check who tried to run a command with sudo for example, but can't find it.

The first Google search says /var/log/syslog but I don't see any information related to sudo there.

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It's logged remotely: xkcd.com/838 – depquid Mar 31 '13 at 12:21
up vote 16 down vote accepted

On redhat based linux systems like centos or fedora it is in:


and for debian based systems like ubuntu it is in:

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Never mind, it is in /var/log/auth.log.

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Notices should also be emailed to root by default, though that is configurable. – depquid Mar 31 '13 at 13:21

in Fedora it is in /var/log/audit/audit.log

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it depends to the /etc/sudoers file, you should search for this record: Default logfile = /var/log/file_name – Shahram Pezeshki Sep 8 '15 at 15:04

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