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Redirect Error To Null Bash

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Redirect Stderr To Dev Null And Stdout To File

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Redirect Stderr To Null Windows

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 68841322 add a comment| 4 Answers 4 active oldest votes up redirect stderr to file 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 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 reaso

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Redirect Stdin To /dev/null

Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions 1 dev null 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; http://askubuntu.com/questions/350208/what-does-2-dev-null-mean 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 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 http://unix.stackexchange.com/questions/75616/always-redirect-error-to-dev-null 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 /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 indicativ

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 http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ 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, http://www.unix.com/shell-programming-and-scripting/25772-redirect-stderr-dev-null-bash-env.html 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. stderr to

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 redirect stderr to @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 or redirect stdout and stderr into different files?Disable The Mail Alert By Crontab Command On a Linux or Unix-like SystemsPrinting output of c program to a file in LinuxUnix / Linux: Save Output To Fil

Scripting BSD, Linux, and UNIX shell scripting Post awk, bash, csh, ksh, perl, php, python, sed, sh, shell scripts, and other shell scripting languages questions here. Search Forums Show Threads Show Posts Tag Search Advanced Search Unanswered Threads Find All Thanked Posts Go to Page... learn unix and linux commands redirect stderr to dev/null in bash env. Shell Programming and Scripting Page 1 of 2 1 2 > Thread Tools Search this Thread Display Modes #1 03-07-2006 Sniper Pixie Registered User Join Date: Feb 2006 Last Activity: 25 March 2006, 2:10 PM EST Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts redirect stderr to dev/null in bash env. Working in a bash environment, in the following example, how do I direct the error message that putting in an invalid flag (-j for example) would normally produce to dev/null? while getopts "abcd" opt do case "$opt" in i) a etc ;; r) b etc ;; f) c etc ;; v) d etc ;; \?) direct actual error message to dev/null exit 1 ;; esac done Remove advertisements Sponsored Links Sniper Pixie View Public Profile Find all posts by Sniper Pixie #2 03-07-2006 vino Supporter (in vino veritas) Join Date: Feb 2005 Last Activity: 8 February 2016, 5:12 PM EST Location: Sydney, Down Under Posts: 2,848 Thanks: 0 Thanked 13 Times in 13 Posts Quote: Originally Posted by Sniper Pixie Working in a bash environment, in the following example, how do I direct the error message that putting in an invalid flag (-j for example) would normally produce to dev/null? while getopts "abcd" opt do case "$opt" in i) a etc ;; r) b etc ;; f) c etc ;; v) d etc ;; \?) direct actual error message to dev/null exit 1 ;; esac done Code: while getopts "abcd" opt do case "$opt" in i) a etc ;; r) b etc ;; f) c etc ;; v) d etc ;; *) exit 1 ;; esac done Just exit. Remove advertisements Spon

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