This is suitable sometimes for cron entries, if you want a command to pass in absolute silence.
rm -f $(find / -name core) &> /dev/nullThis (thinking on the A file descriptor can be a file name of the address of a stream. '&' is the address operator as in the C language. bash-script null share|improve this question asked Mar 14 '14 at 4:20 JohnMerlino 71341428 1 Redirecting to /dev/null won't prevent crashing, but will clean up the stdout and stderr output streams. 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 have a peek at this web-site
Then create a new compressed file. But I can see how you didn't really answer the question here. –erickson Sep 23 '12 at 17:05 add a comment| Not the answer you're looking for? What am I doing wrong? more stack exchange 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 http://askubuntu.com/questions/350208/what-does-2-dev-null-mean
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? How to describe very tasty and probably unhealthy food Code Golf Golf Golf How to adjust UI scaling for Chrome? 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
What's a Racist Word™? Would it be ok to eat rice using spoon in front of Westerners? It can be used to suppress any output. 1 Dev Null Much more information is available at The Linux Documentation Project's I/O Redirection page.
Didn't know that one. & Dev Null Both outputs are now on the same chanel (1). >/dev/null: means that the standard output (and the standard error output) is sent to /dev/null. /dev/null is a special file: Data written In this case, something is being redirected into /dev/null, and something is being redirected into &1. http://unix.stackexchange.com/questions/119648/redirecting-to-dev-null Schrödinger's cat and Gravitational waves Where's the 0xBEEF?
Print some JSON Does Anna know what a ball is? Redirect Stderr To Dev Null And Stdout To File So share up, coders and newbies. :) BZT Reply Link Saartube January 19, 2011, 10:31 am Thank you :)) Reply Link ciccio October 2, 2011, 9:11 am Hi, how can I Follow him on Twitter. There are always three default files open.
When you run a script that gives you an output and if we add a > /dev/null 2>&1 at the end of the script, we are asking the script to write http://unix.stackexchange.com/questions/80629/redirect-both-stderr-and-stdout-to-dev-null-with-bin-sh If the square root of two is irrational, why can it be created by dividing two numbers? Redirect Error To Dev Null asked 3 years ago viewed 126722 times active 1 year ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Linked 3 Get current ssh session's originating IP without Redirect Only Stdout To Dev Null stderr).
To break it up: 2 is the handle for standard error or STDERR 1 is the handle for standard output or STDOUT 2>&1 is asking to direct all the STDERR as http://supercgis.com/dev-null/redirect-standard-out-and-error-to-dev-null.html bash chose &> (now also supported by zsh and some pdksh derivatives) though it clearly breaks POSIX compliance since foo &> file is perfectly valid POSIX syntax which means something completely Here is a snippet of my code: echo "Enter the number" read $N > text …. In bash you can do this with &>/dev/null but that's a bash extension. Redirect Output To Null Windows
File descriptor 2 is still redirected to stdout, no matter what happens to file descriptor 1. /dev/null 2 &1 Ambiguous Output Redirect What is the meaning of the 90/10 rule of program optimization? しっているはずです is over complicated? Another way (more convenient?) to disable mail is to use the '-m off' option, i.e.
Newer Older Comments UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up or log in to customize your list. The program usually prints to standard output, and sometimes prints to standard error. 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 have a peek here When a girl mentions her girlfriend, does she mean it like lesbian girlfriend?
How to explain the use of high-tech bows instead of guns Is it safe for a CR2032 coin cell to be in an oven? to treat all the error messages generated from the script as its standard output). Include both the Standard Error and Standard Out. How is this red/blue effect created?
Print some JSON Does WiFi traffic from one client to another travel via the access point? 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 Is the domain of a function necessarily the same as that of its derivative? Reply Link Security: Are you a robot or human?
Here’s an example command: wibble > /dev/null 2>&1 Output redirection The greater-thans (>) in commands like these redirect the program’s output somewhere. Warning: the order of redirection matters: >/dev/null 2>&1 is not the same as 2>&1 >/dev/null Try these two commands with a non-privileged user: ls >/dev/null 2>&1 ls 2>&1 >/dev/null Indeed, in without causing the script to crash (kind of like try catch exception handling in programming languages). He just wanted to know what it means 2>/dev/null –Radu Rădeanu Sep 27 '13 at 15:02 The OP probably changed the question.
Hot Network Questions Does using a bonus action end One with Shadows? Print some JSON How to search for flights for a route staying within in an alliance?