These three file descriptors (you can think of them as “data pipes”) are often called STDIN, STDOUT, and STDERR. Not the answer you're looking for? Why did the distance requirement for my buddy change? What are the difficulties of landing on an upslope runway Should I define the relations between tables in database or just in code? have a peek at this web-site
cron share|improve this question edited Oct 21 '14 at 13:31 Stéphane Chazelas 179k28289517 asked Oct 21 '14 at 12:59 Aw Qirui Guo 99861625 marked as duplicate by derobert, Braiam, slm♦ Oct What is way to eat rice with hands in front of westerners such that it doesn't appear to be yucky? share|improve this answer answered Oct 21 '14 at 13:14 chaos 27.5k65095 add a comment| up vote 2 down vote From the manual cron(8): When executing commands, any output is mailed to Problems with amsmath Cannot patch Sitecore initialize pipeline (Sitecore 8.1 Update 3) Why did the distance requirement for my buddy change? http://unix.stackexchange.com/questions/119648/redirecting-to-dev-null
To be clear the standard output (stdout) of the command is meant. Problems with amsmath Can a secure cookie be set from an insecure HTTP connection? 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
You might not have write access, the file might already exist, etc. –Sparhawk Mar 14 '14 at 4:27 Just a trick to avoid unnecessary output. What happens if the same field name is used in two separate inherited data templates? Its much similar to the solution provided by geirha, but its more explicit (bash coding can easily become very obscured). Redirect Output To Null Windows 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
Well I need to relearn some shell. –Shou Ya Aug 19 '12 at 14:26 In my case, the 2>&1 needed to go at the end, eg: if ping -c & Dev Null What does Toph's wanted poster say? 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 Join them; it only takes a minute: Sign up Shell: redirect stdout to /dev/null and stderr to stdout [duplicate] up vote 22 down vote favorite 10 This question already has an
How come Ferengi starships work? Redirect Stderr To Dev Null And Stdout To File It's not quite like a try/catch or anything. asked 2 years ago viewed 47258 times active 2 years ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Linked 43 What does '>/dev/null 2>&1' mean in this 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
Because using > /dev/null 2>&1 will redirect all your command output (include both stdout and stderr) to /dev/null, causing no outputs are printed to terminal. http://www.xaprb.com/blog/2006/06/06/what-does-devnull-21-mean/ 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). Redirect Error To Dev Null UNIX is a registered trademark of The Open Group. Redirect Only Stdout To Dev Null 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
briefly: all STDERR and STDOUT messages will be redirect to /dev/null share|improve this answer edited Oct 21 '14 at 13:14 slm♦ 167k40305474 answered Oct 21 '14 at 13:11 arash javan 25819 Check This Out Is cardinality a well defined function? So, you discard the output and cron has nothing to send. It's free: ©2000-2016 nixCraft. 1 Dev Null
How come Ferengi starships work? It can be used to suppress any output. share|improve this answer edited Aug 19 '12 at 14:38 answered Aug 19 '12 at 14:25 Zaar Hai 1,90831727 add a comment| up vote -2 down vote Well, that's because you can't. http://supercgis.com/dev-null/redirect-output-error-to-dev-null.html That I found I even can't find a flexible way to do this in one-line command with sh.
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 Stdin To /dev/null How to adjust UI scaling for Chrome? 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
Code Golf Golf Golf What is way to eat rice with hands in front of westerners such that it doesn't appear to be yucky? 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 The chunk >/dev/null is redirecting stdout to /dev/null. '2>&1' is redirecting the error stream to the output stream, which has been redirected to /dev/null. /dev/null 2 &1 Ambiguous Output Redirect 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
I mean: I want to launch a command: - if all goes good --> no output - if something goes wrong --> output of errors Thanks, Ciccio Reply Link SilversleevesX October UNIX is a registered trademark of The Open Group. Why do composite foreign keys need a separate unique constraint? have a peek here Welcome to share you mind about this. :) linux bash shell sh share|improve this question asked Aug 19 '12 at 14:14 Shou Ya 92011032 marked as duplicate by tripleeebash Users with
cd /home # This creates the archive tar cf /var/tmp/home_franky.tar franky > /dev/null 2>&1 # First remove the old bzip2 file. By default, if you don’t name or number one explicitly, you’re talking about STDOUT. Redirect standard output; overwrite file if it exists >&! In other words, the script is silenced.
Here is a snippet of my code: echo "Enter the number" read $N > text …. 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 tar could cause errors in a variety of ways. Another way (more convenient?) to disable mail is to use the '-m off' option, i.e.
Modo di dire per esprimere "parlare senza tabù" What's the point of Pauli's Exclusion Principle if time and space are continuous? Let's assume stdin (fd 0), stdout (fd 1) and stderr (fd 2) are all connected to a tty initially, so 0: /dev/tty, 1: /dev/tty, 2: /dev/tty The first thing that gets For example something like rm -rf /home/somename/a.txt. As for why tar can cause errors: because the target directory does not exist, because the source doesn't, because you don't have write access to the target, or read to the
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 Also, when I do script > /dev/null why does only STDOUT go to /dev/null and not everything? –sbhatla Mar 26 at 2:26 add a comment| up vote 11 down vote This For example 2>&1 redirects 2 (standard error) to 1 (standard output); if 1 has been redirected to a file, 2 goes there too. Trick or Treat polyglot If the square root of two is irrational, why can it be created by dividing two numbers?
Why is international first class much more expensive than international economy class? stdout) and file descriptor '2' is standard error (a.k.a. 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>&- &