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URL:
https://askubuntu.com/q/1196247
Title:
Where are error messages of failed application starts?
ID:
/2019/12/15/Where-are-error-messages-of-failed-application-starts_
Created:
December 15, 2019
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October 19, 2025
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This question is probably a duplicate of:
There are two answers there:
- Check the contents of
~/.xsession-errorslog and, - Redirect output when calling command:
command >~/log/command.out.log 2>~/log/command.err.log
Also if the process ID is known look at it’s file descriptor 1 for stdout and 2 for stderr. This is described in detail in Unix & Linux:
To briefly summarize the top-voted answer:
lsof -p1234 | awk '$4 ~ /^[12][^0-9]/'
ls -l /proc/1234/fd/[12]
Of course the most common method is to simply call the GUI from the command line and your terminal window will show warning and error messages:
$ zenity --info --text "Hello World"
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.