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I've just had to diagnose a fault that turned out to be because someone had edited a systemd definition (*.service) file and left an error behind. The result was that the service did not show up as failed but also did not run so my question is:

Is there a way to list all systemd units that have service definition errors?

As an example, here is the status of the job that failed:

localhost:~# systemctl status -l custom
● custom.service - Custom script
   Loaded: loaded (/usr/lib/systemd/system/custom.service; disabled; vendor 
preset: disabled)
   Active: inactive (dead)

Sep 12 16:00:25 localhost.localdomain systemd[1]: 
[/usr/lib/systemd/system/custom.service:20] Unknown section 'Path'. Ignoring.

I've tried listing dead services but there are many of them and most seem to be correct but just ended - what I want is to find the ones that have genuine errors such as this one.

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    systemd-analyze verify ... will do some checks. see man systemd-analyze. Commented Sep 13, 2018 at 12:07
  • It is a little verbose but that's certainly good enough for what I want - thanks. Commented Sep 13, 2018 at 14:15
  • I am turning @meuh ’s answer into an answer, because, well, it is one. Commented Nov 20, 2020 at 17:26

1 Answer 1

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systemd-analyze verify … will do some checks.

see man systemd-analyze for options.

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