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Stupid tricks

Generate a list of users with a uid greater than 500

awk -F: '$3 > 500 {print $1}' /etc/passwd

Look for users with a space after the username grep " :x" /etc/passwd

It is possible to set the TZ variable on a per user or even per script basis.

If you are a bash user for example, you can place this in your ~/.bashrc file:

export TZ="/usr/share/zoneinfo/US/Eastern"

Find all the users who aren't running irssi

comm -13 <(ps -C irssi -o fuser |grep -v USER|sort|uniq) <(awk -F: '$3 > 500 {print $1}' /etc/passwd)

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