If you indeed used command /bin/null on CentOS, you have created a common file file named /bin/null on your system. You may say 'It worked!' , if you want. This file now contains the stdout and stderr output of your command. Usually, in /bin/ there are only executable files. And usually, only the root user is allowed to create files there. Or, you can redirect the output to one place, and the errors to another. Dir file.xxx output.msg 2 output.err You can print the errors and standard output to a single file by using the '&1' command to redirect the output for STDERR to STDOUT and then sending the output from STDOUT to a file. Stack Overflow Public questions and answers; Teams Private questions and answers for your team; Enterprise Private self-hosted questions and answers for your enterprise; Talent Hire technical talent.
How do I redirect output and errors to /dev/null under bash / sh shell scripting? How do I redirect the output of stderr to stdout, and then redirect this combined output to /dev/null device? In Unix, how do I redirect error messages to /dev/null?Unix 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.
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Syntax to redirect error and output messages to /dev/null
The syntax discussed below works with Bourne-like shells, such as sh, ksh, and bash:
OR
You can also use the same syntax for all your cronjobs to avoid emails and output / error messages:
OR
@hourly /scripts/backup/nas.backup >/dev/null 2>&1
OR
@hourly /scripts/backup/nas.backup &>/dev/null
Redirect both standard error and standard out messages to a log file
C++ Redirect Stdout To File
You can always redirect both standard error (stdin) and standard out (stdout) text to an output file or a log file by typing the following command:
Want to close stdout and stderr for the command being executed on a Linux/Unix/BSD/OSX bash shell?
Try the following syntax:
See man pages: ksh(1)
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Posix Redirect Stdout To File
Hi,
I've never worked with stderr and stdout before. I have an application that sends an obscene number of messages to the Console log, so implemented the following shell script to launch it in future:
/Volumes/Storage/Shared/Games/UrbanTerror/ioUrbanTerror.app/Contents/MacOS/ioUrb anTerror.ub >> 2&>1 /dev/null
No further entries appeared in the Console so I thought I was sorted, but then I discovered two files in the root of my Home directory called 1 and 2 respectively, and these contained the log outputs. I thought /dev/null was supposed to be the computer equivalent of 'oblivion,' so have I implemented the shell script incorrectly?
Also, can someone further modify my script so that stdout goes to /dev/null and stderr goes to a log file in a location of my choosing?
Many thanks,
S.
I've never worked with stderr and stdout before. I have an application that sends an obscene number of messages to the Console log, so implemented the following shell script to launch it in future:
/Volumes/Storage/Shared/Games/UrbanTerror/ioUrbanTerror.app/Contents/MacOS/ioUrb anTerror.ub >> 2&>1 /dev/null
No further entries appeared in the Console so I thought I was sorted, but then I discovered two files in the root of my Home directory called 1 and 2 respectively, and these contained the log outputs. I thought /dev/null was supposed to be the computer equivalent of 'oblivion,' so have I implemented the shell script incorrectly?
Also, can someone further modify my script so that stdout goes to /dev/null and stderr goes to a log file in a location of my choosing?
Many thanks,
S.
Redirect Stderr To Dev Null C Programming
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