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communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us redirect stdout and stderr to dev null Learn more about Stack Overflow the company Business Learn more about hiring developers redirect stderr to dev null and stdout to file or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and 1 dev null 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 question Anybody can answer The best answers are voted up redirect stderr to dev null c 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 69341322 add a comment| 4 Answers 4 active oldest votes up vote 85 down vote accepted The

/dev/null 2 &1 In Linux

> 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 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 McQuee

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Redirect Stderr To Null Windows

the company Business Learn more about hiring developers or posting ads with us Unix & find 2 dev null Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users & dev null of Linux, 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 http://askubuntu.com/questions/350208/what-does-2-dev-null-mean to the 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 http://unix.stackexchange.com/questions/75616/always-redirect-error-to-dev-null In short: yes - 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 Si

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About http://unix.stackexchange.com/questions/163352/what-does-dev-null-21-mean-in-this-article-of-crontab-basics Us Learn more about Stack Overflow the company Business Learn more about hiring http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, 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 dev null a question Anybody can answer The best answers are voted up and rise to the top What does '>/dev/null 2>&1' mean in this article of crontab basics? [duplicate] up vote 43 down vote favorite 27 This question already has an answer here: redirecting to /dev/null 2 answers I am reading an article about crontab There is something about disabling automatically sending emails. Disable Email By default cron jobs stderr to dev sends an email to the user account executing the cronjob. If this is not needed put the following command At the end of the cron job line. >/dev/null 2>&1 What is the detailed meaning for 2 > & and 1? Why putting this to the end of a crontab file would turn off the email-sending thing? cron share|improve this question edited Oct 21 '14 at 13:31 Stéphane Chazelas 179k28289519 asked Oct 21 '14 at 12:59 Aw Qirui Guo 1,00361625 marked as duplicate by derobert, Braiam, slm♦ Oct 21 '14 at 16:59 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 6 Answers 6 active oldest votes up vote 63 down vote accepted > is for redirect /dev/null is a black hole where any data sent, will be discarded 2 is the file descriptor for Standard Error > is for redirect & is the symbol for file descriptor (without it, the following 1 would be considered a filename) 1 is the file descriptor for Standard Out Therefore >/dev/null 2>&1 is redirect the output of your program to /dev/null. Include both the Standard Error a

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 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? 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 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 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 FileUnix and Linux: Redirect Error Output To null CommandLinux / Unix Find Command: Avoid Permission Denied MessagesBASH Shell: How To Redirect stderr To stdout ( redirect stderr to a File )How do I save

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