Command to check if the system requires a reboot

BasioMeusPuga · 2013-11-27 13:54:27

Hey,

Pretty self explanatory. I just want to know if there's a command that checks if a reboot is needed.
I've Googled for this and the few results I've gotten are for Ubuntu/RHEL.

Thanks.

karol · 2013-11-27 13:59:40

Sometimes an update will tell you in pacman's output that you should reboot.
I think there already was a thread about this on the forums.

Reboot after kernel upgrade.

tomk · 2013-11-27 14:14:20

Compare the running kernel version to the installed version, and display a message saying "REBOOT NOW" if they're different. This can be easily automated in a script.

Or just watch pacman's output and reboot when you see a kernel upgrade. :-)

BasioMeusPuga · 2013-11-27 14:17:18

I grepped my pacman log and there's only 5 instances of the word "reboot" in the ~2 years this installation has lasted. As it is, this isn't suited for monitoring purposes.
Also, I checked the forums. Unless I'm missing something, the threads that talk about anything remotely similar are mostly to do with troubleshooting/"How often do you reboot?".

I think the question is still valid. Is there a command that checks to see if a reboot is required? To rephrase, does a kernel (module) upgrade touch a file/variable somewhere that can be checked?

Edit: Yeah. I thought about scripting this. Seemed a little excessive at the time though. I guess that's where I'll go. Thanks.

Last edited by BasioMeusPuga (2013-11-27 14:19:08)

karol · 2013-11-27 14:22:22

nvidia packages use https://projects.archlinux.org/svntogit … ges/nvidia

post_install() {
    EXTRAMODULES='extramodules-3.12-ARCH'
    depmod $(cat /usr/lib/modules/$EXTRAMODULES/version)
    echo 'In order to use nvidia module, reboot the system.'
}

WorMzy · 2013-11-27 14:28:31

There is no command that can tell you when you 'need' to reboot, you have to use common sense.

karol · 2013-11-27 14:32:34

My take on tomk's suggestion:

#!/usr/bin/bash

s1=$(pacman -Q linux | sed 's/linux //')
s2=$(uname -r | sed 's/-ARCH//')

if [ "$s1" == "$s2" ]; then
  echo OK
else
  echo REBOOT
fi

graysky · 2013-11-27 14:37:50

Whenever the nfs-utils package gets updated, on my configuration, I need to reboot the machine or else shares are not exported. I have tried restarting the indiviual nfs services but only the reboot fixes it. SO... you might wanna add nfs-utils to your list of "REBOOT" packages if this is true for you too.

A related thread: https://bbs.archlinux.org/viewtopic.php?id=173341

karol · 2013-11-27 14:40:24

graysky wrote:

A related thread: https://bbs.archlinux.org/viewtopic.php?id=173341

Thanks. For some reason I thought I was subscribed to this thread but I wasn't.

There's also e.g. https://bbs.archlinux.org/viewtopic.php?id=141095 dealing with the "do I really have to reboot after kernel upgrade?" question.

tomk · 2013-11-27 17:09:55

karol wrote:

My take on tomk's suggestion:

#!/usr/bin/bash

s1=$(pacman -Q linux | sed 's/linux //')
s2=$(uname -r | sed 's/-ARCH//')

if [ "$s1" == "$s2" ]; then
  echo OK
else
  echo REBOOT
fi

Almost exactly what I use, except that you need to accommodate 3.x kernels e.g. 3.12 - in that case, s1 will be 3.12 but s2 will be 3.12.0.

Last edited by tomk (2013-11-27 17:10:13)

Trilby · 2013-11-27 17:36:59

[[ $(pacman -Q linux | cut -d " " -f 2) > $(uname -r) ]] && echo reboot

hongster · 2024-07-26 06:45:05

Trilby wrote:

[[ $(pacman -Q linux | cut -d " " -f 2) > $(uname -r) ]] && echo reboot

String comparison does not work well with version number. "6.10.1.arch1-1" is lesser than "6.9.10-arch1-1" due to comparison of 3rd character ("1" vs "9").

WorMzy · 2024-07-26 14:50:36

Perhaps 'vercmp $(pacman -Q linux | cut -d " " -f 2) $(uname -r)' then.

However, this topic is over a decade old. It's unlikely that OP is still looking for a solution.

Closing.

Arch Linux

#1 2013-11-27 13:54:27

Command to check if the system requires a reboot

#2 2013-11-27 13:59:40

Re: Command to check if the system requires a reboot

#3 2013-11-27 14:14:20

Re: Command to check if the system requires a reboot

#4 2013-11-27 14:17:18

Re: Command to check if the system requires a reboot

#5 2013-11-27 14:22:22

Re: Command to check if the system requires a reboot

#6 2013-11-27 14:28:31

Re: Command to check if the system requires a reboot

#7 2013-11-27 14:32:34

Re: Command to check if the system requires a reboot

#8 2013-11-27 14:37:50

Re: Command to check if the system requires a reboot

#9 2013-11-27 14:40:24

Re: Command to check if the system requires a reboot

#10 2013-11-27 17:09:55

Re: Command to check if the system requires a reboot

#11 2013-11-27 17:36:59

Re: Command to check if the system requires a reboot

#12 2024-07-26 06:45:05

Re: Command to check if the system requires a reboot

#13 2024-07-26 14:50:36

Re: Command to check if the system requires a reboot

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