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Unix Redirecting Error To Null

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Redirect Stdout And Stderr To Dev Null

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Redirect Stderr To Dev Null C

top Always redirect error to /dev/null up vote 13 down vote favorite 3 I know I can redirect the error messages from a command to /dev/null using the following syntax: command arg1 arg2 2>/dev/null But is there a way to do this by default so that the error messages always go to /dev/null, unless I specify otherwise? command-line io-redirection share|improve this question asked May 13 '13 at 7:35 Richard 4511315 1 In short: yes -

Redirect Stderr To Null Windows

redirect /dev/stderr to /dev/null. But, if you can't figure it out on your own, you shouldn't try, as you are more likely to break something fatally than succeed. –Benubird May 13 '13 at 8:11 @Benubird stderr != /dev/stderr. Redirecting that file won't do anything. The file in /dev/ is just for convenience. –Chris Down May 14 '13 at 3:51 @ChrisDown you're right, /dev/stderr is just a link. Still, a lot of processes write to that instead of fd/2, which you could also redirect. It gets more complicated from there - which is why I left a comment instead of an answer :). –Benubird May 14 '13 at 8:11 add a comment| 1 Answer 1 active oldest votes up vote 18 down vote Lots of programs send output to stderr that isn't actually indicative of errors. For example, in some programs it is used to display information that would otherwise affect the output of the program (which is designed to be piped into another program). You can, however, do this: exec 2>/dev/null I wouldn't recommend doing this outside of a script. share|improve this answer answered May 13 '13 at 7:39 Chris Down 56.1k7132168 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and

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2 /dev/null Not Working

question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a 1 dev null question Anybody can answer The best answers are voted up and rise to the top What does 2>/dev/null mean…? up vote 55 down vote favorite 34 I want one or two line description about the following command line: grep -i 'abc' content http://unix.stackexchange.com/questions/75616/always-redirect-error-to-dev-null 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 69841322 add a comment| 4 Answers 4 active oldest votes up vote 86 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 http://askubuntu.com/questions/350208/what-does-2-dev-null-mean 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 edited Dec 29 '14 at 12:51 Griwes 2191213 answered Sep 26 '13 at 8:32 Terry Wang 4,44921521 1 Is there a good reason to use > /dev/null 2>&1 instead of &> /dev/null? –Craig McQueen Nov 30 '15 at 6:43 3 @CraigMcQueen &> is new in Bash 4, the former is just the traditional way, I am just so used to it (easy to remember). –Terry Wang Nov 30 '15 at 12:24 add a comment| up vote 1 down vote dev/null treated as black hole in Linux/Unix, so you can put any this into this but at the end your will not able to get this back from /dev/null/. so further on 2>, means is you are redirecting [i.e. ">"] stderr [i.e. 2] into black hole [i.e. /dev/null/ ] this

BASH Shell, CentOS, Debian / Ubuntu, Fedora Linux, FreeBSD, HP-UX Unix, Linux, Openbsd, Programming, Solaris-Unix, Suse, Troubleshooting, Ubuntu Linux, UNIXHow do I redirect output and errors to http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ /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? You can send output to /dev/null, by using command >/dev/null syntax. However, this will not work when command will use the standard dev null 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/nullThe 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>&1ORcommand &>/dev/null job arg1 stderr to dev arg2 &>/dev/null /path/to/script arg1 &>/dev/nullYou 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/nullRedirect both standard error and standard out messages to a log fileYou 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>&1Want 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 FileUnix and Linux: Redirect Error Output T

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