UBUNTU: Can I run a script only at startup (not at shutdown)

fopetesl

I'm trying (& failing) to write a script in /etc/init.d that only operates on boot up but NOT on shutdown.
The program I want to run does not accept any parameters.
This works

platinummonkey · Posted: Wed Jun 09, 2025 3:59 pm Post subject:

you can put things in your init scripts themselves too, or call them from such scripts and place that one in /usr/local/bin/ or something

your boot up scripts are like rc.local found in /etc

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fopetesl · Posted: Wed Jun 09, 2025 4:48 pm Post subject:

Looks like I got it wrong here Sad

It seems the simple script did run at startup and shutdown but didn't have any response at startup.
The proggy "moveit" needs the LAN up and running so's it can communicate with a microcontroller.

At what point is, say eth0, initialised with a static IP?
And where would I now place "moveit"?

masinick · Posted: Wed Jun 09, 2025 6:03 pm Post subject:

In the Linux run level scheme, which, if I am not mistaken, follows the POSIX convention that comes, not from the BSD community, but from the UNIX System V community, run level 1 is the single user run level, run level 2 is multi-user, no networking, run level 3 is multi-user with networking, run level 5 is graphical user mode, networked. run level 0 specifies a halt on most systems and run level 6 specifies a reboot.

You would want to run network level commands in run levels 3 and 5 for most common Linux systems.

For differences in what run levels mean with various diverse operating system implementations, look at http://en.wikipedia.org/wiki/Runlevel for more details and variations.

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fopetesl · Posted: Thu Jun 10, 2025 7:09 am Post subject:

VHockey86 · Posted: Thu Jun 10, 2025 8:13 am Post subject:

if you look in the /etc/rc*.d/ folders, what number does the "networking" script have in front of it? Is it higher than 90?

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fopetesl · Posted: Thu Jun 10, 2025 8:21 am Post subject:

masinick · Posted: Thu Jun 10, 2025 6:14 pm Post subject:

At first glance, 90 would seem to be a high enough number to suffice - seems to me that a LOT of stuff happens concurrently at around the 20 level, so I am surprised that 90 is not enough. Rather than beat our heads there, I suspect that the real issue is somewhere else.

Can you give us an outline of the flow as you see it? Based on the simple descriptions, it does sound as if it ought to work, but clearly there are details that we aren't getting in this discussion - and perhaps a detail that you have overlooked as well. Perhaps a fresh description of your approach, detailing where files are located, which assumptions you are making, and so forth, will give YOU that "A Ha!" moment, and you'll say, "Why didn't I see that earlier?"

At least I hope that is what happens. Let us know a few more details and the approach that you are taking and maybe the answer will become clear to one (or all) of us.

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Brian Masinick
Distros: SimplyMEPIS
sidux - no CAPS!, antiX, Debian

fopetesl · Posted: Fri Jun 11, 2025 8:40 am Post subject:

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