Not the answer you're looking for? Reply Link Hugues November 12, 2013, 4:33 pm l often do the following and I do not want an error (just a 0 length file) You get a valid output if The program usually prints to standard output, and sometimes prints to standard error. Jul 13 at 13:30 This question has been asked before and already has an answer. Source
How could a language that uses a single word extremely often sustain itself? File descriptor 2 is still redirected to stdout, no matter what happens to file descriptor 1. Examples: % who > names Redirect standard output to a file named names % (pwd; ls -l) > out Redirect output of both commands to a file named out % pwd; Bitwise rotate right of 4-bit value Is cardinality a well defined function?
Next Previous Contents Standard Input and Output Redirection The shell and many UNIX commands take their input from standard input (stdin), write output to standard output (stdout), and write error output In Unix, how do I redirect error messages 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. Equivalent for "Crowd" in the context of machines Some part of my plot has been hiding Does bitcoin have the potential to be subject to a hard fork where miners are
How to search for flights for a route staying within in an alliance? 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. Are the plane and the third dimensional space homeomorphic? Redirect Output To Null Windows These 2 are equivalents: > file and >file.
Browse other questions tagged bash pipe output-redirect dev-null or ask your own question. & Dev Null How do I redirect ALL the output to /dev/null? Browse other questions tagged command-line grep stdout or ask your own question. http://unix.stackexchange.com/questions/119648/redirecting-to-dev-null Here is a snippet of my code: echo "Enter the number" read $N > text ….
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? Redirect Stderr To Dev Null And Stdout To File You can also use >> to append. 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. Do I need to turn off camera before switching auto-focus on/off?
add a comment| 6 Answers 6 active oldest votes up vote 62 down vote accepted > is for redirect /dev/null is a black hole where any data sent, will be discarded That's why they suggest to redirect both to /dev/null in the article. –moooeeeep Oct 21 '14 at 15:52 @moooeeeep Thanks very much for the tip! –Aw Qirui Guo Oct Redirect Error To Dev Null share|improve this answer answered Oct 21 '14 at 14:07 Ambrevar 13413 add a comment| up vote 1 down vote Redirection Bash's reference manual says: The operator [n]>&word is used [...] to Redirect Only Stdout To Dev Null cron will only email you if there is some output from you job.
What does the "stain on the moon" in the Song of Durin refer to? this contact form cd /home # This creates the archive tar cf /var/tmp/home_franky.tar franky > /dev/null 2>&1 # First remove the old bzip2 file. In the following example, myprog, which was written to read standard input and write standard output, is redirected to read myin and write myout. $ myprog < myin > myout You UNIX is a registered trademark of The Open Group. 1 Dev Null
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 Reply Link neonatus October 17, 2012, 7:29 pm @smilyface you can close (omit) the stderr output from telnet command echo â€œopen 192.168.1.10 8080â€³| telnet 2>&- | grep â€“color=auto â€œConnected toâ€ Reply Redirection may fail under some circumstances: 1) if you have the variable noclobber set and you attempt to redirect output to an existing file without forcing an overwrite, 2) if you have a peek here asked 2 years ago viewed 121022 times active 6 months ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Linked 14 redirecting to /dev/null 0 Output of cron
It's free: ©2000-2016 nixCraft. Redirect Stdin To /dev/null When a girl mentions her girlfriend, does she mean it like lesbian girlfriend? A mail is delivered only when there is output on stdout or stderr.
current community chat Unix & Linux Unix & Linux Meta your communities Sign up or log in to customize your list. Forgotten Lost Highway (New Zealand ) - Is it advisable to do it in a rental car? 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>&- & /dev/null 2 &1 Ambiguous Output Redirect It should be: x * * * * /path/to/my/script > /dev/null 2>&1 share|improve this answer edited Apr 22 at 14:26 7ochem 1176 answered Oct 21 '14 at 13:18 Sreeraj 2,32521428 1
Trick or Treat polyglot Should non-native speakers get extra time to compose exam answers? 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 =). What have folks' experiences been with the different commands and bash/sh versions when trying it this way? Check This Out How is being able to break into any linux machine through grub2 secure?
With everything redirected to null, there is no output and hence cron will not email you. tar could cause errors in a variety of ways. The null device is a device file that discards all data written to it. For example, 2> redirects file descriptor 2, or standard error. &n is the syntax for redirecting to a specific open file.
Examples: $ who > names Direct standard output to a file named names $ (pwd; ls -l) > out Direct output of both commands to a file named out $ pwd;