I ran dolphin like this:
dolphin . &
I see messages in the console like these:
QPixmap::scaled: Pixmap is a null pixmap
How can I keep the console clean or silent?
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2 Answers
You can redirect the output to a file or to nowhere.
Using output redirection > you can redirect stdout and/or stderr away from the terminal.
To redirect stdout and stderr to a file use &> log.txt.
If you just want output to go way use &> /dev/null.
So you new command would be dolphin . &> /dev/null &
&> redirects all output
use > or 1> to redirect stdout only
use 2> to redirect stderr only
Note: if you want to append to a file rather than overwrite it use >> in place of >.
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If one then wishes to close the terminal, it helps to also use nohup (although there are other options as well, such as screen).– PantherJun 5, 2014 at 15:09
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@dan08 a single
&should come at the end of the entire command. Your examples with&>are incorrect. The OP's new commands should bedolphin . >/dev/null &which would get rid of just standard output. To ignore both stdout and stderr, the proper command is in Oli's reply. Jun 5, 2014 at 15:09 -
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@InsomniacSoftware I would be curious as well, reference please. I am not doubting you or Oli, I would just like to educate myself.– PantherJun 5, 2014 at 15:33
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using just
>only redirects stdout, but Oli added an extra 2>&1 to send stderr to stdout, so both get redirected by the redirect of stdout. @InsomniacSoftware the&>example is correct but I was wrong about&1>I edited to correct– DanJun 5, 2014 at 15:41
Redirect all the output into a black hole:
dolphin . > /dev/null 2>&1 &
The 2, 1 and 0 (not used here) stand for STDERR (where all the error messages are sent), STDOUT (where normal output goes) and STDIN (where the input) comes from. In a normal terminal STDOUT and STDERR are both printed to screen.
The above example redirects STDOUT with > to /dev/null and then redirects STDERR into STDOUT so both output streams end up at /dev/null.
