LinuxNut.org

umask determines what permissions any new files or directories will have by default. Like file permissions, it historically takes an octal value (e.g. ‘umask 002′), but can also symbolic values (e.g. ‘umask a=rx,ug+w’). I’m going to just focus on the octal values.
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Here’s a bunch of programmer jokes – http://stackoverflow.com/questions/234075/what-is-your-best-programmer-joke

If you should happen to need to know the current time as a unix timestamp, try http://www.unixtime.se/. Alternatively typing

date +%s

at a convenient command line might be faster, and more accurate…