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Redirect Standard Error To File Unix

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 bash redirect stdout and stderr to dev null workings and policies of this site About Us Learn more about Stack Overflow redirect stderr to dev null the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users bash redirect stderr to dev null 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: ambiguous output redirect 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 error cp: failed to extend ‘/mnt/tt/file.txt’:

Csh Redirect Stderr

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 checksums.txt /mnt/app/ >> result_hashdeep.txt 2> error_hashdeep.txt &' or 'hashdeep -rXvvl -j 30 -k chec

UNIX I am a new Ubuntu Linux and bash shell user. I also know how to redirect output from display/screen

Redirect Stderr To Stdout Windows

to a file using the following syntax:

cmd > file ls bash redirect stderr and stdout to different files > file However, some time errors are displayed on screen. How do I store and redirect output from bash write to stderr the computer screen to a file on a Linux or Unix-like systems? Bash / ksh and other modern shell on Linux has three file descriptors: stdin (0) stdout (1) stderr http://askubuntu.com/questions/625224/how-to-redirect-stderr-to-a-file (2) Syntax To redirect all output to file The syntax is as follows to redirect output (stdout) as follows: command-name > output.txt command-name > stdout.txt Syntax To redirect all error to file The syntax is as follows to redirect errors (stderr) as follows: command-name 2> errors.txt command-name 2> stderr.txt Syntax to redirect both output (stdout) and errors (stderr) to different http://www.cyberciti.biz/faq/linux-redirect-error-output-to-file/ files The syntax: command1 > out.txt 2> err.txt command2 -f -z -y > out.txt 2> err.txt Syntax to redirect both output (stdout) and errors (stderr) to same file The syntax is: command1 > everything.txt 2>&1 command1 -arg > everything.txt 2>&1 Syntax to redirect errors (stderr) to null or zero devices Data written to a null or zero special file is discarded by your system. This is useful to silence out errors (also know as ‘error spam'): command1 2> /dev/null command1 2> /dev/zero command2 -arg 2> /dev/null command2 -arg 2> /dev/zero Tip: Use tee command to redirect to both a file and the screen same time The syntax is: command1 |& tee log.txt ## or ## command1 -arg |& tee log.txt ## or ## command1 2>&1 | tee log.txt Another usage: #!/bin/bash # My script to do blah ... foo(){ : } 2>&1 | tee foo.log OR #!/bin/bash # My script to do blah ... { command1 command2 } 2>&1 | tee script.log Share this tutorial on:TwitterFacebookGoogle+Download PDF version Found an error/typo on this page?About the author: Vivek Gite i

>20.3. Applications

There are always three default files [1] open, stdin (the keyboard), stdout (the screen), and stderr (error messages output to the screen). These, and any other open files, can http://www.tldp.org/LDP/abs/html/io-redirection.html be redirected. Redirection simply means capturing output from a file, command, program, script, or even http://stackoverflow.com/questions/7526971/how-to-redirect-both-stdout-and-stderr-to-a-file code block within a script (see Example 3-1 and Example 3-2) and sending it as input to another file, command, program, or script.

Each open file gets assigned a file descriptor. [2] The file descriptors for stdin, stdout, and stderr are 0, 1, and 2, respectively. For opening additional files, redirect stderr there remain descriptors 3 to 9. It is sometimes useful to assign one of these additional file descriptors to stdin, stdout, or stderr as a temporary duplicate link. [3] This simplifies restoration to normal after complex redirection and reshuffling (see Example 20-1).

COMMAND_OUTPUT > # Redirect stdout to a file. # Creates the file if not present, otherwise overwrites it. ls -lR > dir-tree.list # stderr to dev Creates a file containing a listing of the directory tree. : > filename # The > truncates file "filename" to zero length. # If file not present, creates zero-length file (same effect as 'touch'). # The : serves as a dummy placeholder, producing no output. > filename # The > truncates file "filename" to zero length. # If file not present, creates zero-length file (same effect as 'touch'). # (Same result as ": >", above, but this does not work with some shells.) COMMAND_OUTPUT >> # Redirect stdout to a file. # Creates the file if not present, otherwise appends to it. # Single-line redirection commands (affect only the line they are on): # -------------------------------------------------------------------- 1>filename # Redirect stdout to file "filename." 1>>filename # Redirect and append stdout to file "filename." 2>filename # Redirect stderr to file "filename." 2>>filename # Redirect and append stderr to file "filename." &>filename # Redirect both stdout and stderr to file "filename." # This operator is now functional, as of Bash 4, final release. M>N # "M" is a file descriptor, which defaults to 1, if not explicitly set. # "N" is a filename. # File descriptor "M" is redirect to file "N." M>&N # "M" is a file descriptor, which defaults to 1, if not set. # "N" is another file descrip

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 Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.3 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to redirect both stdout and stderr to a file up vote 163 down vote favorite 45 Hi I am running a bash script that creates a log file for the execution of the command I use the following Command1 >> log_file Command2 >> log_file This only sends the standard output and not the standard error which appears on the terminal. Can I log both the stderr and stdout logged to a file? bash stdout stderr share|improve this question edited Sep 23 '11 at 10:11 asked Sep 23 '11 at 9:35 sdmythos_gr 1,67121321 2 possible duplicate of Redirect stderr and stdout in a bash script –Nathan Aug 19 '14 at 19:35 Possible duplicate of How can I redirect and append both stdout and stderr to a file with Bash? –That1Guy May 5 at 15:19 add a comment| 5 Answers 5 active oldest votes up vote 236 down vote accepted If you want to log to the same file: command1 >> log_file 2>&1 If you want different files: command1 >> log_file 2>> err_file share|improve this answer answered Sep 23 '11 at 9:37 Mat 136k21235274 73 And just to save someone else the frustration, note that the order is important: 2>&1 needs to occur after >> log_file. –Rufflewind Jan 2 '14 at 6:34 2 Why >> and not > ? –user3527975 Mar 16 at 21:38 3 >> appends to the file, > overwrites

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