Thanks Adv Reply November 18th, 2009 #4 sisco311 View Profile View Forum Posts Private Message resistance is futile Join Date Feb 2007 Location Romania BeansHidden! Given that context, you can see the command above is redirecting standard output into /dev/null, which is a place you can dump anything you don’t want (often called the bit-bucket), then The length of the null device is always zero.
Not the answer you're looking for? Not the answer you're looking for? Reply Link Security: Are you a robot or human? Find 2 Dev Null How is being able to break into any linux machine through grub2 secure?
Is the domain of a function necessarily the same as that of its derivative? Redirect Stderr To Dev Null And Stdout To File It redirects file descriptor 2 (STDERR) and descriptor 1 (STDOUT) to /dev/null. >/dev/null This is just an abbreviation for 1>/dev/null. Join Date Aug 2008 Beans 47 Re: Redirecting stderr to dev null ?? http://unix.stackexchange.com/questions/70963/difference-between-2-2-dev-null-dev-null-and-dev-null-21 Tagged with: redirect stderr stdout to file, redirect stderr to file, stderr, Easy Next FAQ: sed Tip: Delete All Blank White Spaces Previous FAQ: Ubuntu Linux: Turn On Exec-Shield Buffer Overflow
However, this will not work when command will use the standard error (FD # 2). 1 Dev Null UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up or log in to customize your list. Does Anna know what a ball is? Re: Redirecting stderr to dev null ??
The OP doesn't said nothing about this... http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ 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 Redirect Stdout And Stderr To Dev Null If the square root of two is irrational, why can it be created by dividing two numbers? Redirect Stderr To Dev Null C 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).
Baron Schwartz's Blog What does > /dev/null 2>&1 mean? http://supercgis.com/dev-null/redirect-standard-out-and-error-to-dev-null.html 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 share|improve this answer answered May 13 '13 at 7:39 Chris Down 56k7132168 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google asked 3 years ago viewed 126720 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 Stderr To Null Windows
Powered by Hugo. up vote 96 down vote favorite 53 I found this piece of code in /etc/cron.daily/apf #!/bin/bash /etc/apf/apf -f >> /dev/null 2>&1 /etc/apf/apf -s >> /dev/null 2>&1 It's flushing and reloading the Draw an hourglass Interaction with dummy variable Where's the 0xBEEF? Source What to do when majority of the students do not bother to do peer grading assignment?
The 2>&1 part means "redirect both the output and the error streams". Redirect Stdin To /dev/null What happens if the same field name is used in two separate inherited data templates? Originally Posted by xx77aBs hehe thank you !
How to slow down sessions? Redirecting that file won't do anything. The Rule of Thumb for Title Capitalization Accidentally modified .bashrc and now I cant login despite entering password correctly Does bitcoin have the potential to be subject to a hard fork 2 /dev/null Not Working Browse other questions tagged command-line grep stdout or ask your own question.
It was added in Bash 4. &>/dev/null This is just an abbreviation for >/dev/null 2>&1. so further on 2>, means is you are redirecting [i.e. ">"] stderr [i.e. 2] into black hole [i.e. /dev/null/ ] this is your command : grep -i 'abc' content 2>/dev/null i Sometimes they’re not named, they’re numbered! have a peek here share|improve this answer answered Oct 3 '12 at 20:13 FSMaxB 400113 add a comment| up vote 0 down vote Edit /etc/conf.apf.
share|improve this answer answered Jun 11 '15 at 10:57 UmayKnowMe 1113 add a comment| up vote -3 down vote This grep command has a wrong syntax, It should be something like Can a secure cookie be set from an insecure HTTP connection? STDERR) if a number isn't explicitly given, then number 1 is assumed by the shell (bash) First let's tackle the function of these. you have to redirect the stderr of the du command: Code: du -h -c ~ 2> /dev/null | grep total or: Code: du -h -c ~ 2> /dev/null | tail -n
Your shell comes with three file descriptors as follows:stdin - 0 - Standard Input (usually keyboard or file) stdout - 1 - Standard Output (usually screen) stderr - 2