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                Solaris 2.x and Linux

The rc.x(run control scripts)files reside in /etc

Each rcx file preform actions based on  what init level
the system is going.


The rc.x directories contain hard links to scripts in
/etc/init.d. If they start with "S" then they are start
scripts and "K" means kill script. They are executed based
on the number sequence they are in.

% pwd
% /etc/rc2.d
% ls
K20lp
S01MOUNTFSYS    this is a start script & will start before S69
K60nfs.server   this is a kill script & wil start after K20
S69inet
S75cron

These scripts hard hard links to script in /etc/init.d

% etc/init.d-2pair- ls
MOUNTFSYS
lp
nfs.server
cron



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                Linux  

In linux the files are located in /etc/rc.d the init.d
directory is loacted in there also. The principals
are the same