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I would like to redirect the output generated from a background application in Linux to /dev/null.
I am using kate text editor and it prints all the debug messages on the terminal which I would like to redirect to /dev/null.
Any idea how to do it ?
Thanks
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Similarly, to redirect only the STDERR to /dev/null, use the integer '2' instead of '1' . The integer '2' stands for standard error. As you can see, the standard error is not displayed on the terminal now as it is discarded in /dev/null.
the shortcut is Ctrl + Shift + S ; it allows the output to be saved as a text file, or as HTML including colors!
In technical terms, “/dev/null” is a virtual device file. As far as programs are concerned, these are treated just like real files. Utilities can request data from this kind of source, and the operating system feeds them data. But, instead of reading from disk, the operating system generates this data dynamically.
The way we can redirect the output is by closing the current file descriptor and then reopening it, pointing to the new output. We'll do this using the open and dup2 functions. There are two default outputs in Unix systems, stdout and stderr. stdout is associated with file descriptor 1 and stderr to 2.
You can send output to /dev/null, by using command >/dev/null syntax. However, this will not work when command will use the standard error (FD # 2). So you need to modify >/dev/null as follows to redirect both output and errors to /dev/null. Syntax to redirect error and output messages to /dev/null
You can send output to /dev/null, by using command >/dev/null syntax. However, this will not work when command will use the standard error (FD # 2). [donotprint][/donotprint]So you need to modify >/dev/null as follows to redirect both output and errors to /dev/null.
Now, to redirect only the STDOUT to /dev/null, i.e. to discard the standard output, use the following: What does ‘1>/dev/null’ mean? Here '1' indicates STDOUT, which is a standard integer assigned by Linux for the same. The operator '>', called a redirection operator, writes data to a file. The file specified in this case is /dev/null.
Any idea how to do it ? >/dev/null 2>&1 means redirect stdout to /dev/null AND stderr to the place where stdout points at that time If you want stderr to occur on console and only stdout going to /dev/null you can use: In this case stderr is redirected to stdout (e.g. your console) and afterwards the original stdout is redirected to /dev/null
You use:
yourcommand > /dev/null 2>&1 If it should run in the Background add an &
yourcommand > /dev/null 2>&1 & >/dev/null 2>&1 means redirect stdout to /dev/null AND stderr to the place where stdout points at that time
If you want stderr to occur on console and only stdout going to /dev/null you can use:
yourcommand 2>&1 > /dev/null In this case stderr is redirected to stdout (e.g. your console) and afterwards the original stdout is redirected to /dev/null
If the program should not terminate you can use:
nohup yourcommand & Without any parameter all output lands in nohup.out
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