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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
Upload: November 24, 2022    Layout:  post
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This question is probably a duplicate of:

There are two answers there:

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.
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