Free Software Linux

This is a nice little bit of shell magic I discovered today:

trap true TERM
kill -- -$$

The first line means that when the shell receives a TERM signal,
it executes true. The normal behaviour would be to kill the
process, so this means that the shell is immune to people sending a
TERM signal to it. The second line sends a TERM signal
to the process group (- is the modifier to indicate a the process
group of the PID, not just the PID) of the current process ($$).

The end result? Everything spawned by this script which hasn't gone and
re-parented itself is killed: the ultimate in cleanup.

NP: Dedications, Klimek

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