A very practical guide and a nice reminder of the power of some of the simple unix utilities that have been around forever. One minor correction/change I would

A very practical guide and a nice reminder of the power of some of the simple unix utilities that have been around forever. One minor correction/change I would suggest, in the crontab example within the postfix section: MAILTO=root 0 0 * * * root /usr/local/bin/foobar 2>&1 1>>/var/log/foobar.log This will make it append to an existing log instead of overwriting it.