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Redirecting Standard Output And Standard Error To /dev/null

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 answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business & dev null Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges redirect only stdout to dev null Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a redirect output to null windows 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 top What does 2>/dev/null mean…? up vote 54 down vote favorite 34 I want

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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 Feb 26 '15 at 9:44 asked Sep 26 '13 at 8:21 Naive 68841322 add a comment| 4 Answers 4 active oldest votes up vote 85 down vote accepted The > operator redirects the output usually to a file but it can be to a device. You can also use >> to append. If you don't redirect stderr to dev null and stdout to file specify a number then the standard output stream is assumed but you can also redirect errors > file redirects stdout to file 1> file redirects stdout to file 2> file redirects stderr to file &> file redirects stdout and stderr to file /dev/null is the null device it takes any input you want and throws it away. It can be used to suppress any output. share|improve this answer edited Sep 26 '13 at 13:55 answered Sep 26 '13 at 8:38 Warren Hill 10.4k104463 add a comment| Did you find this question interesting? Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). Subscribed! Success! Please click the link in the confirmation email to activate your subscription. up vote 10 down vote In short, it redirects stderr (fd 2) to the black hole (discard output of the command). 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 log file share|improve this answer edited Dec 29 '14 at 12:51 Griwes 2191213 answered Sep 26 '13 at 8:32 Terry Wang 4,44921521 1 Is there a good reason to use > /dev/null 2>&1 instead of &> /dev/null? –Craig McQueen Nov 30 '15 at 6:43 3 @CraigMcQueen &> is new

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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 top What does '>/dev/null 2>&1' mean in this article http://askubuntu.com/questions/350208/what-does-2-dev-null-mean of crontab basics? [duplicate] up vote 43 down vote favorite 26 This question already has an answer here: redirecting to /dev/null 2 answers I am reading an article about crontab There is something about disabling automatically sending emails. Disable Email By default cron jobs sends an email to the user account executing the cronjob. 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 http://unix.stackexchange.com/questions/163352/what-does-dev-null-21-mean-in-this-article-of-crontab-basics > & and 1? Why putting this to the end of a crontab file would turn off the email-sending thing? 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 21 '14 at 16:59 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. 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 2 is the file descriptor for Standard Error > is for redirect & is the symbol for file descriptor (without it, the following 1 would be considered a filename) 1 is the file descriptor for Standard Out Therefore >/dev/null 2>&1 is redirect the output of your program to /dev/null. Include both the Standard Error and Standard Out. Much more information is available at The Linux Documentation Project's I/O Redirection page. cron will only email you if there is some output from you job. With everything redirected to null, there is no output and hence cron will not email you. share|improve this answer answered Oct 21 '14 at 13:13 garethTheRed 16.2k23148 1 What if the command that I run in the crontab file do not output any

Hugo. RSS Feed. Baron Schwartz's Blog What does > /dev/null 2>&1 mean? Tue, Jun 6, 2006 in Programming I remember being confused for a very long time about the trailing garbage in commands http://www.xaprb.com/blog/2006/06/06/what-does-devnull-21-mean/ I saw in Unix systems, especially while watching compilers do their work. Nobody http://askubuntu.com/questions/350208/what-does-2-dev-null-mean 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 explanation. In this article I’ll explain those weird commands. Here’s an example command: wibble > /dev/null 2>&1 Output redirection The greater-thans dev null (>) in commands like these redirect the program’s output somewhere. In this case, something is being redirected into /dev/null, and something is being redirected into &1. Standard in, out, and error There are three standard sources of input and output for a program. Standard input usually comes from the keyboard if it’s an interactive program, or from another program if it’s processing the other to dev null program’s output. The program usually prints to standard output, and sometimes prints to standard error. These three file descriptors (you can think of them as “data pipes”) are often called STDIN, STDOUT, and STDERR. Sometimes they’re not named, they’re numbered! The built-in numberings for them are 0, 1, and 2, in that order. By default, if you don’t name or number one explicitly, you’re talking about STDOUT. 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 redirecting standard error into standard output (you have to put an & in front of the destination when you do this). The short explanation, therefore, is “all output from this command should be shoved into a black hole.” That’s one good way to make a program be really quiet! I'm Baron Schwartz, the founder and CEO of VividCortex. I am the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration. I contribute to various database communities such as Oracle, PostgreSQL, Redis and MongoDB. Newer Older Comments

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 answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. 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 top What does 2>/dev/null mean…? 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 Feb 26 '15 at 9:44 asked Sep 26 '13 at 8:21 Naive 68841322 add a comment| 4 Answers 4 active oldest votes up vote 85 down vote accepted The > operator redirects the output usually to a file but it can be to a device. You can also use >> to append. If you don't specify a number then the standard output stream is assumed but you can also redirect errors > file redirects stdout to file 1> file redirects stdout to file 2> file redirects stderr to file &> file redirects stdout and stderr to file /dev/null is the null device it takes any input you want and throws it away. It can be used to suppress any output. share|improve this answer edited Sep 26 '13 at 13:55 answered Sep 26 '13 at 8:38 Warren Hill 10.4k104463 add a comment| up vote 10 down vote In short, it redirects stderr (fd 2) to the black hole (discard output of the command). 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 log file share|improve this answer edited Dec 29 '14 at 12:51 Griwes 2191213 answered Sep 26 '13 at 8:32 Terry Wang 4,44921521 1 Is there a good reason to use > /dev/null 2>&1 instead of &> /dev/null? –Craig McQueen Nov 30 '15 at 6:43 3 @CraigMcQueen &> is new in Bash 4, the former is just the traditional way, I am just so used to it (easy to remember). –Terry Wang Nov 30 '15 at 12:24 add a comment| up vote 1 down vote dev/null treated as black hole in Linux/Unix, so you can put any this into this but at the end your will not able to get this back from /dev/null/. 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 co

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