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So, if I run a program through the menus in gnome-shell, is there a way to view stdout and stderr? Or is there some kind of hack to achieve this functionality?

Or is everything just sent to /dev/null?

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up vote 4 down vote accepted

Usually, gdm/session start-up scripts redirect stderr & stdout to either:

~/.xsession-errors

or

~/.cache/gdm/session.log

With systemd and recent gdm versions, everything is redirected to systemd journal, so one way to get that output is:

journalctl -b _PID=$(pgrep gnome-session)
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I think gnome-session doesn't necessarily run anymore (I'm on gnome 3.14, because pgrep doesn't find it, though I'm definitely in gnome ;) – ufotds Feb 9 '15 at 5:09
    
@ufotds - it all depends on your particular setup, but on a normal gnome setup it definitely runs (I'm on a vanilla gnome 3.14.2 install and pgrep gnome-session works fine). – don_crissti Feb 9 '15 at 10:20

The command suggested by don_crissti didn't show anything for me, but I just do:

journalctl -f

in a terminal tab that I always leave open (and opens automatically on boot) so I have realtime feedback of all logging from systemd on my computer.

If desired, you can use the match filters from journalctl to limit the noise, but for now I like to have everything at hand.

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