Changing default configuration of programs with /etc/default

In modern Linux distributions, there is a special directory named /etc/default which holds the default configuration informations on some services, programs etc.

For example on a Debian based system, you can set

TMPTIME=7
FSCKFIX=yesin /etc/default/rcS so that your system holds files in /tmp directory not older than 7 days and makes automatic fsck fix when a problem exists on disk. Or you can set

GROUP=500in /etc/default/useradd so that your newly created users have 500 group id in default. There are more, just look at contents of /etc/default

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