Command logging?

[Todd C. Miller]

By default sudo logs to syslogd.  This means you need to setup
syslog.conf to log the sudo messages to a file.  Current sudo
distributions contain a sample.syslog.conf file that illustrates
what you need to do.  There is also a bit in the FAQ about it.

Alternately you can tell sudo to log to a file by adding a line
like:

Defaults	logfile=/var/log/sudo.log

to the top of your sudoers file, assuming you are running sudo version
1.6 or higher.

 - todd