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Gerald Schneider
Gerald Schneider
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I'm trying to reboot a number of Ubuntu servers via script when a reboot is necessary.

When I execute bash with the test as a noninteractive command I get the result that no reboot is required, even though the file /var/run/reboot-required exists.

usera@client:~$ ssh server02 bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
server02: no reboot required

When I log on to the same server via SSH and run my test manually I get the correct result, sudo reboot.

usera@client:~$ ssh server02
Last login: Tue Jun 14 08:03:00 2022 from 146.140.16.1
usera@server02:~$ test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"
sudo reboot
usera@server02:~$ bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
sudo reboot

Why is bash behaving differently when being invoked byWhat do I need to change to get the ssh command versus an interactive logincorrect result?

I'm trying to reboot a number of Ubuntu servers via script when a reboot is necessary.

When I execute bash with the test as a noninteractive command I get the result that no reboot is required, even though the file /var/run/reboot-required exists.

usera@client:~$ ssh server02 bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
server02: no reboot required

When I log on to the same server via SSH and run my test manually I get the correct result, sudo reboot.

usera@client:~$ ssh server02
Last login: Tue Jun 14 08:03:00 2022 from 146.140.16.1
usera@server02:~$ test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"
sudo reboot
usera@server02:~$ bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
sudo reboot

Why is bash behaving differently when being invoked by the ssh command versus an interactive login?

I'm trying to reboot a number of Ubuntu servers via script when a reboot is necessary.

When I execute bash with the test as a noninteractive command I get the result that no reboot is required, even though the file /var/run/reboot-required exists.

usera@client:~$ ssh server02 bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
server02: no reboot required

When I log on to the same server via SSH and run my test manually I get the correct result, sudo reboot.

usera@client:~$ ssh server02
Last login: Tue Jun 14 08:03:00 2022 from 146.140.16.1
usera@server02:~$ test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"
sudo reboot
usera@server02:~$ bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
sudo reboot

What do I need to change to get the correct result?

Post Reopened by ilkkachu bash
Post Closed as "Duplicate" by muru bash
Source Link
Gerald Schneider
Gerald Schneider
  • 922
  • 11
  • 22

bash test wrong result when run noninteractively

I'm trying to reboot a number of Ubuntu servers via script when a reboot is necessary.

When I execute bash with the test as a noninteractive command I get the result that no reboot is required, even though the file /var/run/reboot-required exists.

usera@client:~$ ssh server02 bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
server02: no reboot required

When I log on to the same server via SSH and run my test manually I get the correct result, sudo reboot.

usera@client:~$ ssh server02
Last login: Tue Jun 14 08:03:00 2022 from 146.140.16.1
usera@server02:~$ test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"
sudo reboot
usera@server02:~$ bash -c 'test -f /var/run/reboot-required && echo sudo reboot || echo "$(hostname): no reboot required"'
sudo reboot

Why is bash behaving differently when being invoked by the ssh command versus an interactive login?