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Redirect Standard Error To /dev/null

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Redirect Stderr To Dev Null And Stdout To File

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a question Anybody can answer The best answers are voted up and rise to the top What does 2>/dev/null mean…? up vote 54 down vote favorite 34 I want one or two line description about the following command line: grep -i 'abc' content 2>/dev/null command-line grep stdout share|improve this question edited Feb 26 '15 at 9:44 asked Sep 26 '13 at 8:21 Naive find 2 dev null 68841322 add a comment| 4 Answers 4 active oldest votes up vote 85 down vote accepted The > operator redirects the output usually to a file but it can be to a device. You can also use >> to append. If you don't specify a number then the standard output stream is assumed but you can also redirect errors > file redirects stdout to file 1> file redirects stdout to file 2> file redirects stderr to file &> file redirects stdout and stderr to file /dev/null is the null device it takes any input you want and throws it away. It can be used to suppress any output. share|improve this answer edited Sep 26 '13 at 13:55 answered Sep 26 '13 at 8:38 Warren Hill 10.4k104463 add a comment| up vote 10 down vote In short, it redirects stderr (fd 2) to the black hole (discard output of the command). Some more common use case command > /dev/null 2>&1 & run command in background, discard stdout and stderr command >> /path/to/log 2>&1 & run command and redirect stdout and stderr to log file share|improve this answer edite

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Redirect Stdin To /dev/null

Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, 2 /dev/null not working FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the http://askubuntu.com/questions/350208/what-does-2-dev-null-mean top Difference between 2>&-, 2>/dev/null, |&, &>/dev/null and >/dev/null 2>&1 up vote 77 down vote favorite 61 Just looking for the difference between 2>&- 2>/dev/null |& &>/dev/null >/dev/null 2>&1 and their portability with non-Bourne shells like tcsh, mksh, etc. shell io-redirection file-descriptors csh portability share|improve this question edited May 21 '14 at 8:40 Gilles 374k696801129 asked Apr 3 '13 at 1:25 Det 498156 1 Note that, while mksh supports &> for GNU bash compatibility, http://unix.stackexchange.com/questions/70963/difference-between-2-2-dev-null-dev-null-and-dev-null-21 it’s strongly encouraged to not use this, as parsing it can break the semantics of existing POSIX scripts, and mksh disables that in POSIX mode already. –mirabilos Feb 27 '14 at 13:56 add a comment| 2 Answers 2 active oldest votes up vote 108 down vote accepted For background: a number 1 = standard out (i.e. STDOUT) a number 2 = standard error (i.e. STDERR) if a number isn't explicitly given, then number 1 is assumed by the shell (bash) First let's tackle the function of these. For reference see the Advanced Bash-Scripting Guide. Functions 2>&- The general form of this one is M>&-, where "M" is a file descriptor number. This will close output for whichever file descriptor is referenced, i.e. "M". 2>/dev/null The general form of this one is M>/dev/null, where "M" is a file descriptor number. This will redirect the file descriptor, "M", to /dev/null. 2>&1 The general form of this one is M>&N, where "M" & "N" are file descriptor numbers. It combines the output of file descriptors "M" and "N" into a single stream. |& This is just an abbreviation for 2>&1 |. It was added in Bash 4. &>/dev/null This is just an abbreviation for >/dev/null 2>&1. It redirects file descriptor 2 (STDERR) and descriptor 1 (STDOUT) to /dev/null. >/dev/null This is just an abbreviation for 1>/dev/null.

2015 in BASH Shell, CentOS, Debian / Ubuntu, Fedora Linux, FreeBSD, HP-UX Unix, Linux, Openbsd, Programming, Solaris-Unix, Suse, Troubleshooting, Ubuntu Linux, UNIX How do http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ I redirect output and errors to /dev/null under bash / sh shell http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html 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? You can send output to /dev/null, by using command >/dev/null syntax. However, this will not work when command will dev null 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 The syntax discussed below works with Bourne-like shells, such as sh, ksh, and bash: $ command > /dev/null 2>&1 $ ./script.sh > /dev/null 2>&1 $ ./example.pl > /dev/null 2>&1 stderr to dev OR command &>/dev/null job arg1 arg2 &>/dev/null /path/to/script arg1 &>/dev/null You can also use the same syntax for all your cronjobs to avoid emails and output / error messages: @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 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: command > file 2>&1 /path/to/my/cool/appname > myapp.log 2>&1 Want to close stdout and stderr for the command being executed on a Linux/Unix/BSD/OSX bash shell? Try the following syntax: ## Thanks http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/#comment-40252 ## command 1>&- 2>&- ## Note: additional '&' at the end of job to put it in backgrounds ## job 1>&- 2>&- & command 1>&- 2>&- & See man pages: bash(1), ksh(1) Share this tutorial on:TwitterFacebookGoogle+Download PDF version Found an error/typo on this page?About the author: Vivek Gite is a seasoned sysadmin and a trainer for the Linux/Unix & shell scripting. Follow him on Twitter. OR read more like this:Linux Redirect Error Output To Fi

a stderr redirect stderr to a stdout redirect stderr and stdout to a file redirect stderr and stdout to stdout redirect stderr and stdout to stderr 1 'represents' stdout and 2 stderr. A little note for seeing this things: with the less command you can view both stdout (which will remain on the buffer) and the stderr that will be printed on the screen, but erased as you try to 'browse' the buffer. 3.2 Sample: stdout 2 file This will cause the ouput of a program to be written to a file.

 ls -l > ls-l.txt 
Here, a file called 'ls-l.txt' will be created and it will contain what you would see on the screen if you type the command 'ls -l' and execute it. 3.3 Sample: stderr 2 file This will cause the stderr ouput of a program to be written to a file.
 grep da * 2> grep-errors.txt 
Here, a file called 'grep-errors.txt' will be created and it will contain what you would see the stderr portion of the output of the 'grep da *' command. 3.4 Sample: stdout 2 stderr This will cause the stderr ouput of a program to be written to the same filedescriptor than stdout.
 grep da * 1>&2 
Here, the stdout portion of the command is sent to stderr, you may notice that in differen ways. 3.5 Sample: stderr 2 stdout This will cause the stderr ouput of a program to be written to the same filedescriptor than stdout.
 grep * 2>&1 
Here, the stderr portion of the command is sent to stdout, if you pipe to less, you'll see that lines that normally 'dissapear' (as they are written to stderr) are being kept now (because they're on stdout). 3.6 Sample: stderr and stdout 2 file This will place every output of a program to a file. This is suitable sometimes for cron entries, if you want a command to pass in absolute silence.
 rm -f $(find / -name core) &> /dev/null 
This (thinking on the cron entry) will delete every file called 'core' in any directory. Notice that you should be pretty sure of what a command is doing if you are going to wipe it's output. Next Previous Contents

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