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 After command 2> >(grep 'something' > grep.log) grep.log contains the same the same output as ungrepped.log from command 2> ungrepped.log –Tim Aug 20 '13 at 14:44 @Tim it works It will make STDERR point to STDOUT and then change STDOUT to something else (without touching STDERR) Here is a more detailed tutorial covering both those misconceptions http://wiki.bash-hackers.org/howto/redirection_tutorial Reply Link iek There are two incorrect concepts in your answer. have a peek at this web-site
So, where is the wrong syntax? What have folks' experiences been with the different commands and bash/sh versions when trying it this way? This answer seems to belong to another question. –sivann Sep 26 at 15:27 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Does dropping a Coursera course look bad in a PhD application to the university offering the course?
Tue, Jun 6, 2006 in Programming I remember being confused for a very long time about the trailing garbage in commands I saw in Unix systems, especially while watching compilers do Tagged with: error message, I/O redirection, keyboard, Linux, log program, program error, redirect stderr stdout to file, redirect stderr to file, redirect stdout to file, redirection, standard error, stderr, stdin, stdout, Here is a snippet of my code: echo "Enter the number" read $N > text …. See the tcsh man page for more details.
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 to the I was searching how resolve this problem, and your solution work perfect for me! Hot Network Questions Genitive vs Ablative of Price Problems with amsmath Why is the bridge on smaller spacecraft at the front but not in bigger vessel? Find 2 Dev Null asked 6 years ago viewed 201371 times active 4 months ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Get the weekly newsletter!
Does using a bonus action end One with Shadows? Redirect Stderr To Dev Null And Stdout To File Next Previous Contents UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up or log in to customize your list. For reference see the Advanced Bash-Scripting Guide. http://unix.stackexchange.com/questions/75616/always-redirect-error-to-dev-null These 2 are equivalents: > file and >file.
How to leave a job for ethical/moral issue to a potential employer without explaining details What to do when majority of the students do not bother to do peer grading assignment? Redirect Stderr To File Can a secure cookie be set from an insecure HTTP connection? I contribute to various database communities such as Oracle, PostgreSQL, Redis and MongoDB. Connected to 192.168.1.10 (192.168.1.10) ------------------------------------- How can I get rid of "Connection closed by foreign host." ?
Thanks! http://askubuntu.com/questions/350208/what-does-2-dev-null-mean This means that the STDOUT is redirected first. (When you have > without a stream number, it actually have an implicit 1) And only after STDERR is redirected to "the same Redirect Stdout And Stderr To Dev Null 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. Redirect Stderr To Dev Null C Reply Link ma thesh February 2, 2015, 6:16 pm How to get the error help in shell window Reply Link Alex October 19, 2015, 10:02 am Thanks!
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There are 3 default standard files (standard streams) open: [a] stdin - Use to get input (keyboard) i.e. Browse other questions tagged command-line grep stdout or ask your own question. If so, why is it allowed? Source I know it's not recommended, but for someone like myself, with scripts they either run daily or don't run for months and then go through a spate of executing them two
How come Ferengi starships work? Redirect Stdin To /dev/null 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. I am the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration.
All rights reserved. Nothing goes to the pipe, and thus "grep" will close out without displaying anything on the screen. Both still print the error message, with the added bonus of yours producing a question mark as well, Vino. 1 Dev Null Why do composite foreign keys need a separate unique constraint?
Reply Link Sekkuar September 2, 2013, 7:20 pm Incorrect. Basically you can: redirect stdout to a file redirect stderr to a file redirect stdout to a stderr redirect stderr to a stdout redirect stderr and stdout to a file redirect If you're given an hour, is it bad to finish a job talk in half an hour? (Seemingly) simple trigonometry problem Do I need to turn off camera before switching auto-focus have a peek here UNIX is a registered trademark of The Open Group.
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 Draw an hourglass Proving an equality in set theory Is it safe for a CR2032 coin cell to be in an oven? And why grep -ri? –Radu Rădeanu Sep 26 '13 at 9:02 By the way, he could also be looking for the string /support/security/bulletins/ in the file called content =). 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
Code Golf Golf Golf How is this red/blue effect created? However, this will not work when command will use the standard error (FD # 2). Privacy - Terms of Service - Questions or Comments Baron Schwartz's Blog · Stay Curious!