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Redirect Stderr To Dev Null

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Bash Redirect Stderr To Dev Null

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 bash pipe stderr 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 How to redirect stderr to a file up vote 9 down vote favorite 1 While using nohup to put a command to run in background some of content appear in terminal. cp: error reading ‘/mnt/tt/file.txt’: Input/output ambiguous output redirect error cp: failed to extend ‘/mnt/tt/file.txt’: Input/output error I want to save that content to a file. command-line redirect share|improve this question edited May 18 '15 at 13:42 asked May 18 '15 at 12:31 André M. 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 standard error (stderr). Error messages, like the ones you show, are printed to standard error. The classic redirection operator (command > file) only redirects standard output, so standard error is still shown on the terminal. 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: command >out 2>&1 Redirect both to a file: command &> out For more information on the various control and redirection operators, see here. share|improve this answer answered May 18 '15 at 12:50 terdon♦ 42.5k686154 So 'hashdeep -rXvvl -j 30 -k checksum

updated March 12, 2008 in BASH Shell, Linux, UNIX Q. How do I redirect stderr to stdout? How do I redirect stderr to a file? A.

Tcsh Redirect Stderr

Bash and other modern shell provides I/O redirection facility. There are 3 default redirect stdout and stderr to file windows standard files (standard streams) open: [a] stdin - Use to get input (keyboard) i.e. data going into a program.

Tee Stderr

[b] stdout - Use to write information (screen) [c] stderr - Use to write error message (screen) Understanding I/O streams numbers The Unix / Linux standard I/O streams with numbers: Handle Name Description 0 http://askubuntu.com/questions/625224/how-to-redirect-stderr-to-a-file stdin Standard input 1 stdout Standard output 2 stderr Standard error Redirecting the standard error stream to a file The following will redirect program error message to a file called error.log: $ program-name 2> error.log
$ command1 2> error.log Redirecting the standard error (stderr) and stdout to file Use the following syntax: $ command-name &>file OR $ command > file-name 2>&1 Another useful example: # find http://www.cyberciti.biz/faq/redirecting-stderr-to-stdout/ /usr/home -name .profile 2>&1 | more Redirect stderr to stdout Use the command as follows: $ command-name 2>&1 Share this tutorial on:TwitterFacebookGoogle+Download PDF version Found an error/typo on this page?About the author: Vivek Gite is a seasoned sysadmin and a trainer for the Linux/Unix & shell scripting. Follow him on Twitter. OR read more like this:How do I save or redirect stdout and stderr into different files?Linux Redirect Error Output To FileBASH Shell Redirect Output and Errors To /dev/nullUnix and Linux: Redirect Error Output To null CommandPrinting output of c program to a file in LinuxUnix / Linux: Save Output To FilePython Run External Command And Get Output On Screen or In VariablePython Execute Unix / Linux Command ExamplesLinux / Unix Find Command: Avoid Permission Denied MessagesHow to gzip and keep original file on Unix or Linux command line { 11 comments… add one } Sayed Ahmad February 12, 2012, 12:11 am What this mean? $ command > file-name 2>&1 Reply Link Hesham M January 22, 2014, 3:34 pm This means redirect stdout to file-name, with that in mind redirect stderr t stdout. This will lead to both stderr and stdout go to file-name. Reply Link Shane Hathaway Febru

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 http://askubuntu.com/questions/625224/how-to-redirect-stderr-to-a-file 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 http://wiki.bash-hackers.org/syntax/redirection 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 How to redirect stderr to a file up vote 9 stderr to down vote favorite 1 While using nohup to put a command to run in background some of content appear in terminal. 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. command-line redirect share|improve this question edited May 18 '15 at 13:42 asked May 18 '15 at 12:31 André M. Faria 4061718 add a comment| 1 Answer 1 active oldest votes up vote 16 down stderr to dev vote accepted There are two main output streams in Linux (and other OSs), standard output (stdout)and standard error (stderr). Error messages, like the ones you show, are printed to standard error. The classic redirection operator (command > file) only redirects standard output, so standard error is still shown on the terminal. 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: command >out 2>&1 Redirect both to a file: command &> out For more information on the various control and redirection operators, see here. share|improve this answer answered May 18 '15 at 12:50 terdon♦ 42.5k686154 So 'hashdeep -rXvvl -j 30 -k checksums.txt /mnt/app/ >> result_hashdeep.txt 2> error_hashdeep.txt &' or 'hashdeep -rXvvl -j 30 -k checksums.txt /mnt/app/ >> result_hashdeep.txt 2>&1' or 'hashdeep -rXvvl -j 30 -k checksums.txt /mnt/app/ &> result_mixed.txt' –André M. Faria May 18 '15 at 12:59 1 @AndréM.Faria yes. But the last two commands are equivalent, they will send both error and output to the same file. –terdon♦ May 18 '15 at 13:17 As in the link you provided, I could use |& instead of 2>&1 they are equivalent, thanks for you time. –André M. Faria May 18 '15 at 13:38 @terdon how do I redirect output to

of Contents Redirection Valid redirection targets and sources Redirecting output Appending redirected output Redirecting output and error output Appending redirected output and error output Transporting stdout and stderr through a pipe Redirecting input Here documents Here strings Multiple redirections Examples See also Discussion Redirection Fix me: To be continued Redirection makes it possible to control where the output of a command goes to, and where the input of a command comes from. It's a mighty tool that, together with pipelines, makes the shell powerful. The redirection operators are checked whenever a simple command is about to be executed. Under normal circumstances, there are 3 files open, accessible by the file descriptors 0, 1 and 2, all connected to your terminal: NameFDDescription stdin0standard input stream (e.g. keyboard) stdout1standard output stream (e.g. monitor) stderr2standard error output stream (usually also on monitor) The terms "monitor" and "keyboard" refer to the same device, the terminal here. Check your preferred UNIX®-FAQ for details, I'm too lazy to explain what a terminal is Both, stdout and stderr are output file descriptors. Their difference is the convention that a program outputs payload on stdout and diagnostic- and error-messages on stderr. If you write a script that outputs error messages, please make sure you follow this convention! Whenever you name such a filedescriptor, i.e. you want to redirect this descriptor, you just use the number: # this executes the cat-command and redirects its error messages (stderr) to the bit bucket cat some_file.txt 2>/dev/null Whenever you reference a descriptor, to point to its current target file, then you use a "&" followed by a the descriptor number: # this executes the echo-command and redirects its normal output (stdout) to the standard error target echo "There was an error" 1>&2 The redirection operation can be anywhere in a simple command, so these examples are equivalent: cat foo.txt bar.txt >new.txt cat >new.txt foo.txt bar.txt >new.txt cat foo.txt bar.txt Every redirection operator takes one or two words as operands. If you have to use operands (e.g. filenames to redirect to) that contain spaces you must quote them! Valid redirection targets and sources This syntax is recognized whenever a TARGET o

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