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Your system's initscript will look similar to the following:
: # @(#) initscrp.dfl 22.2 94/02/23 # # # set up the default environment for command started by init. # # Usage: /etc/initscript id level action cmd #PATH=/bin:/usr/bin export PATH
HZ=100 export HZ
[ -x /etc/TIMEZONE ] && . /etc/TIMEZONE
umask 027
LEVEL=$3 export LEVEL
eval exec "$4"
initscript sets the PATH variable, sets the HZ variable, checks for an /etc/TIMEZONE file and executes it, sets the umask, and runs the fourth argument (process), which is the process field from /etc/inittab.
The LEVEL variable can be used to find out the current value of
the action field (the third argument) read from /etc/inittab.
For example, to ensure that your startup script, as identified in the
inittab file, is executed when the system enters single-user mode,
test that the value of LEVEL is sysinit. See
inittab(F)
for information on the sysinit action.
HZ is the hertz value, as described in environ(M).
/etc/TIMEZONE sets and exports the TZ
variable, as described in
environ(M).