To the author of the original post, It depends what you need to achieve. Forgotten Lost Highway (New Zealand ) - Is it advisable to do it in a rental car? What happens if the same field name is used in two separate inherited data templates? 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 to standard error have a peek at this web-site
How is being able to break into any linux machine through grub2 secure? Faria 4061718 add a comment| 1 Answer 1 active oldest votes up vote 16 down vote accepted There are two main output streams in Linux (and other OSs), standard output (stdout)and How to describe very tasty and probably unhealthy food Does Anna know what a ball is? cp: error reading ‘/mnt/tt/file.txt’: Input/output error cp: failed to extend ‘/mnt/tt/file.txt’: Input/output error I want to save that content to a file.
Reply Link xuhui November 24, 2014, 1:19 pm Useful for me!!!! 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>&- & ls -yz 2>&1 >> command.log # Outputs an error message, but does not write to file. # More precisely, the command output (in this case, null) #+ writes to the file, If so, why is it allowed?
Reply Link Shane Hathaway February 24, 2012, 1:02 am Sayed: that line means execute the command while redirecting both stdout and stderr to a file given by file-name. What does the "stain on the moon" in the Song of Durin refer to? So… I tried to redirect the stderror & stdout to /dev/null this way: rm * /directory1/directory2/ > 2&>1 /dev/null kept changing /dev/null form a special file & other users need crw-rw-rw- Bash Redirect Stderr To Dev Null What does the "stain on the moon" in the Song of Durin refer to?
You can display a message on to STDERR by redirecting STDOUT into STDERR as follows − $ echo message 1>&2 Redirection Commands Following is the complete list of commands which you it cause original logfile is allways owerwritten. 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 http://stackoverflow.com/questions/637827/redirect-stderr-and-stdout-in-a-bash-script In the second case, it only knows that it is reading its input from standard input so it does not display file name.
Changing STDOUT after STDERR had been redirected to STDOUT won't change STDERR. Csh Redirect Stderr exec 3<> File # Open "File" and assign fd 3 to it. It is sometimes useful to assign one of these additional file descriptors to stdin, stdout, or stderr as a temporary duplicate link.  This simplifies restoration What i've tried: if ls ./python* 2> /dev/null; then echo found Python fi Which works, if Python is not present it will mute the error messages from ls.
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 good explanation, I'd like to make a function on C that redirects STDIN and SDTOUT to an script, how can I do that, I mean, the exist a library's on C Redirect Stderr To File Reply Link iamfrankenstein June 12, 2014, 8:35 pm I really love: "command2>&1 | tee logfile.txt" because tee log's everything and prints to stdout . Redirect Stderr To Dev Null and >&!
If i open text in vi i am getting blank lines and i have saved my script as number.sh and done chmod on the script to give it user permissions as Check This Out Use >> and >>& to append output to existing files. shell io-redirection openbsd share|improve this question asked Jun 25 '13 at 19:12 Torxed 73031029 add a comment| 1 Answer 1 active oldest votes up vote 37 down vote accepted I believe Genitive vs Ablative of Price Does dropping a Coursera course look bad in a PhD application to the university offering the course? Ambiguous Output Redirect
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 To discard both output of a command and its error output, use standard redirection to redirect STDERR to STDOUT − $ command > /dev/null 2>&1 Here 2 represents STDERR and 1 Tagged with: > /dev/null 2>&1, cronjobs, I/O redirection, output error messages, redirect stderr to file, redirect stdout to file, standard error, stderr, Easy Next FAQ: FreeBSD: Install bindgraph To Make Graphs Source Reply Link RudyD April 2, 2012, 12:47 pm Greetings!
I'm much more inclined to put up with circumstances after the fact, and I seldom write anything that's too destructive (on the system or OS/hardware install and performance level, at any Bash Redirect Stderr To Variable The accepted answer do_something &>filename doesn't. +1. –Withheld Jan 4 '13 at 16:01 4 @Daniel, but this question is specifically about bash –John La Rooy Aug 19 '13 at 3:38 echo 1234567890 > File # Write string to "File".
Note that file descriptor 0 is normally standard input (STDIN), 1 is standard output (STDOUT), and 2 is standard error output (STDERR). n > fileOutput from stream with descriptor n redirected to file. For example, this will still output an error message: ps -ef | grep | grep ps > /dev/null 2>&1 Reply Link nixCraft February 2, 2015, 8:14 pm Try: (ps -ef | Bash Redirect Stderr And Stdout To Different Files Redirection of I/O, for example to a file, is accomplished by specifying the destination on the command line using a redirection metacharacter followed by the desired destination.
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 Reply Link Shyam November 18, 2015, 4:10 pm Hi, Please tell me how to redirect the output from a script to a log file so that i can save all the To redirect stderr as well, you have a few choices: Redirect stderr to another file: command > out 2>error Redirect stderr to stdout (&1), and then redirect stdout to a file: have a peek here Join them; it only takes a minute: Sign up Redirect stderr and stdout in a Bash script up vote 369 down vote favorite 118 I want to redirect both stdout and
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Put '2>&1' after '>file.log' and it works. –user25148 Mar 12 '09 at 9:25 1 Good point, I seem to have been doing this wrong all these years... Reply Link Sekkuar September 2, 2013, 7:20 pm Incorrect.