Related 2Difference between > and | with /dev/tty6the usage of < /dev/null & in the command line4“>/dev/null 2>&1” in `if` statement7Is this redirecting to /dev/null?53Is >&- more efficient than >/dev/null?3Meaning of shell io-redirection file-descriptors csh portability share|improve this question edited May 21 '14 at 8:40 Gilles 374k696801129 asked Apr 3 '13 at 1:25 Det 498156 1 Note that, while mksh supports Tagged with: > /dev/null 2>&1, cronjobs, I/O redirection, output error messages, redirect stderr to file, redirect stdout to file, standard error, stderr, Easy Next FAQ: FreeBSD: Install bindgraph To Make Graphs UNIX is a registered trademark of The Open Group. Source
UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up or log in to customize your list. What to do with my pre-teen daughter who has been out of control since a severe accident? See also rc for better designed operators. –Stéphane Chazelas Oct 24 '14 at 9:26 Update: about the performance issue, that's also confirmed here: unix.stackexchange.com/questions/163955/… –Det Apr 16 at 14:24 Why did the Ministry of Magic choose an ax for carrying out a death sentence? http://askubuntu.com/questions/350208/what-does-2-dev-null-mean
share|improve this answer edited Oct 25 '14 at 20:36 Jonathan Callen 31018 answered Apr 3 '13 at 3:44 slm♦ 167k40305474 We have a winner. to foo*). discards date command output: ### Show on screen ### date ### Discards date command output ### date > /dev/null Syntax: Standard Error (stderr -2 no) to a file or /dev/null Manually modify lists for survival analysis How to search for flights for a route staying within in an alliance?
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 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 RSS Feed. Find 2 Dev Null In this normal case, a program like grep will receive a glob pattern which does not match a file name, hence it will typically fail (file not found).
The OP doesn't said nothing about this... 1 Dev Null How could a language that uses a single word extremely often sustain itself? Does dropping a Coursera course look bad in a PhD application to the university offering the course? The script does NOT run as root, which works because it removes the correct files but not the root-level stuff in directory2 (that I don't want to remove).
Why did the Ministry of Magic choose an ax for carrying out a death sentence? http://askubuntu.com/questions/350208/what-does-2-dev-null-mean New employee has offensive Slack handle due to language barrier Why did the Ministry of Magic choose an ax for carrying out a death sentence? Redirect Stdout And Stderr To Dev Null share|improve this answer answered Aug 30 '15 at 6:45 Uri 162420 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Redirect Stderr To Dev Null C Nobody I asked could tell me what the funny greater-thans, ampersands and numbers after the commands meant, and search engines never turned up anything but examples of it being used without
How come Ferengi starships work? this contact form All about redirection 3.1 Theory and quick reference There are 3 file descriptors, stdin, stdout and stderr (std=standard). I wrote a script (according to this question) to count the number of passed and failed tests. It's free: ©2000-2016 nixCraft. Redirect Stderr To Null Windows
you can put them before or after the command. Join them; it only takes a minute: Sign up How do I redirect errors to /dev/null in bash? How to explain the use of high-tech bows instead of guns Does the Iron Man movie ever establish a convincing motive for the main villain? http://supercgis.com/dev-null/redirect-std-error-to-dev-null.html What's a Racist Word™?
done share|improve this answer answered Aug 9 '15 at 7:06 anubhava 386k32164234 1 Yes, it works. Redirect Stdin To /dev/null What happens if the same field name is used in two separate inherited data templates? script says: ping $1 > $1 Please assist if possible Reply Link SilversleevesX July 20, 2010, 4:16 am How reliable, if that's the word I'm looking for, is ending a particular
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. Anti-static wrist strap around your wrist or around your ankle? (Seemingly) simple trigonometry problem Why do composite foreign keys need a separate unique constraint? Should non-native speakers get extra time to compose exam answers? しっているはずです is over complicated? 2 /dev/null Not Working BASH Shell Redirect Output and Errors To /dev/null by Vivek Gite on February 11, 2009 last updated February 2, 2015 in BASH Shell, CentOS, Debian / Ubuntu, Fedora Linux, FreeBSD, HP-UX
These three file descriptors (you can think of them as “data pipes”) are often called STDIN, STDOUT, and STDERR. All rights reserved. The OP doesn't said nothing about this... http://supercgis.com/dev-null/redirect-error-to-dev-null.html 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
How is this red/blue effect created? It combines the output of file descriptors "M" and "N" into a single stream. |& This is just an abbreviation for 2>&1 |. But the problem is, if the files are not there (in $yesterday_logs $today_logs), I get error messages. But so there's no performance difference or some such with 2>&- vs 2>/dev/null (other than that some "poorly" written programs don't undrestand 2>&- correctly)? –Det Apr 6 '13 at 14:38 1
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>&- & It can be used to suppress any output.