sysv init scripts -- differentiate between first run (boot) and subsequent runs

Asked Jan 16 '15 at 17:26

Active Jan 16 '15 at 17:26

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Normally sysv init scripts are run at boot time (from /etc/init.d/rcS) with the 'start' argument. However they can also be invoked with the 'start' after boot, for exmaple when a service is stopped and then manually restarted.

Is there a "standard", generic way for an init script to differentiate between the first run (at boot) and subsequent runs? (other than manual solutions such as creating a file on the first run and checking for it on subsequent runs)

asked Jan 16 '15 at 17:26

Grodriguez

I would be interested why you would differentiate these states? – Christopher Perrin Jan 16 '15 at 17:45
The script needs to do some startup checks that should only be done once, at boot time, but not once the system is running. – Grodriguez Jan 16 '15 at 18:53
You could check the current runlevel – Christopher Perrin Jan 16 '15 at 19:25
I'm using busybox init -- no runlevels.. – Grodriguez Jan 16 '15 at 19:26

sysv init scripts -- differentiate between first run (boot) and subsequent runs

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