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Redirect Std Error To Dev Null

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 redirect stdout and stderr to dev null the workings and policies of this site About Us Learn more about redirect stderr to dev null and stdout to file Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions redirect stderr to dev null c Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's redirect stderr to null windows how it works: Anybody can ask 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

Find 2 Dev Null

at 9:44 asked Sep 26 '13 at 8:21 Naive 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

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1 Dev Null

Us Learn more about Stack Overflow the company Business Learn more about hiring 2 /dev/null not working developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux & dev null 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 http://askubuntu.com/questions/350208/what-does-2-dev-null-mean a question Anybody can answer The best answers are voted up and rise 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, http://unix.stackexchange.com/questions/75616/always-redirect-error-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 /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 rec

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 http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ 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 http://stackoverflow.com/questions/12027170/shell-redirect-stdout-to-dev-null-and-stderr-to-stdout 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 # dev null 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 to dev null 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 Messa

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 Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.3 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Shell: redirect stdout to /dev/null and stderr to stdout [duplicate] up vote 22 down vote favorite 10 This question already has an answer here: How to pipe stderr, and not stdout? 9 answers I saw this interesting question at a comment on cyberciti.biz. That I found I even can't find a flexible way to do this in one-line command with sh. As far my thought for the solution is: tmp_file=`mktemp` (./script 2>$tmp_file >/dev/null; cat $tmp_file) | ./other-script rm tmp_file But you see, this is not synchronous, and fatally, it's so ugly. Welcome to share you mind about this. :) linux bash shell sh share|improve this question asked Aug 19 '12 at 14:14 Shou Ya 92011032 marked as duplicate by tripleeebash Users with the bash badge can single-handedly close bash questions as duplicates and reopen them as needed. Jul 13 at 13:30 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. 3 Did you try ./script.sh 2>&1 > /dev/null ? –cnicutar Aug 19 '12 at 14:21 @cnicutar It seemed I have a wrong understanding in the start. I supposed 2>&1 will redirect stderr to stdout and the 1>/dev/null will then redirect both them into /dev/null. Well I need to relearn some shell. –Shou Ya Aug 19 '12 at 14:26 In my case, the 2>&1 needed to go at the end, eg: if ping -c 1 fake.x > /dev/null 2>&1;then echo true;else echo false;fi –Jonathan Cross Nov 20 '15 at 22:31 add a comment| 3 Answers 3 active oldest votes up vote 65 down vote accepted You want ./script 2>&1 >/dev/null | ./other-script The order here is important. Let's assume stdin (fd 0), stdout (fd 1) and stderr (fd 2) are all connected to a tty initially, so 0: /dev/tty, 1: /dev/tty, 2: /dev/tty The first thing that gets set up is the pipe. other-script's stdin gets connected to the pipe, and script's stdout gets connected to the pipe, so script's file descriptors so far look like: 0: /dev/tty, 1: pipe, 2: /dev/tty Next, the redirections occur, from left to right. 2>&1 makes fd 2 go wherever fd 1 is currently going, which is the pipe. 0:

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