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From: Ralf Fassel <ralfixx@gmx.de>
Newsgroups: comp.os.linux.misc
Subject: Re: xdg-open script question
Date: Wed, 25 May 2022 12:20:05 +0200
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* Kirk_Rockstein <Kirk_Rockstein@nowhere.invalid>
| kirk@shuttle:~$ /usr/bin/git-annex webapp
| /usr/bin/git-annex: Relink `/usr/lib/i386-linux-gnu/libmagic.so.1' with `/lib/i386-linux-gnu/libpthread.so.0' for IFUNC symbol `vfork'
| Launching web browser on file:///home/kirk/annex/.git/annex/webapp.html
| /usr/bin/xdg-open: line 811: : command not found
>
| Where do I start to trouble shoot this, at line 811 of the xdg-open script?

I would run

  sh -x /usr/bin/xdg-open file:///home/kirk/annex/.git/annex/webapp.html

from the command line and see whether it gives the same error.

If it does, the outpout (which is plenty and probably should be
redirected to a file) should give a hint what the problem is.

I suspect that the problem is a lookup on a command which is not found,
and thus the shell tries to execute "":

    $ ""
    sh: : command not found

HTH
R'