use: command 2>&1 1>/dev/null Reply Link nixCraft October 6, 2011, 12:54 am No, it does not matters. 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 Can I solve x on this way? Why does HSTS not automatically apply to subdomains to enhance security? have a peek at this web-site
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 am the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration. Privacy - Terms of Service - Questions or Comments Next Previous Contents 3. This is suitable sometimes for cron entries, if you want a command to pass in absolute silence.
rm -f $(find / -name core) &> /dev/nullThis (thinking on the
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 SQL Server: Why does COUNT() aggregate return 0 for 'NULL'? Reply Link Security: Are you a robot or human? What do you call someone without a nationality?
In Unix, how do I redirect error messages to /dev/null? up vote 54 down vote favorite 34 I want one or two line description about the following command line: grep -i 'abc' content 2>/dev/null command-line grep stdout share|improve this question edited In this example, first, send output of date command to the screen and later to the /dev/null i.e. Find 2 Dev Null Unix and Linux: Redirect Error Output To null Command by Vivek Gite on June 5, 2013 last updated June 5, 2014 in BASH Shell, KSH Shell, Linux, UNIX I‘m a new
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 Good programming practice dictates that error messages should go to FD 2 and normal output to FD 1, but you will often find sloppy programming that mixes the two or otherwise Fighting a dragon with modern military units (or Smaug vs. One must read the redirection chains from left to right since that is the way the shell processes them.
When we speak of a group, must we explicitly specify a certain binary operation? 1 Dev Null asked 3 years ago viewed 127228 times active 1 year ago Linked 3 Get current ssh session's originating IP without being superuser Related 29What does outputting to /dev/null accomplish in bash 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 Didn't know that one.
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 http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/ Whether a program writes something to FD1 or FD2, is entirely up to the programmer. Redirect Stdout And Stderr To Dev Null cp overwrite vs rm then cp Do working electrical engineers in circuit design ever use textbook formulas for rise time, peak time, settling time, etc Infinite loops in TeX I have Redirect Stderr To Dev Null C Nothing goes to the pipe, and thus "grep" will close out without displaying anything on the screen.
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Receive Email Notifications? Check This Out You can, however, do this: exec 2>/dev/null I wouldn't recommend doing this outside of a script. I was searching how resolve this problem, and your solution work perfect for me! For what reason would someone not want HSTS on every subdomain? Redirect Stderr To Null Windows
Some more common use case command > /dev/null 2>&1 & run command in background, discard stdout and stderr command >> /path/to/log 2>&1 & run command and redirect stdout and stderr to 2 /dev/null Not Working file iplist has a long list of IP's on the network and i need to send this to a script that creates a file with the ping info. Trick or Treat polyglot Is there a numerical overview over your XP progression?
It gets more complicated from there - which is why I left a comment instead of an answer :). –Benubird May 14 '13 at 8:11 add a comment| 1 Answer 1 All output that "command" writes to its FD 1 (stdout) makes its way to /dev/null. Why can't linear maps map to higher dimensions? have a peek here Why were Navajo code talkers used during WW2?