Command Line Redirect Standard Error
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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 command line redirect my documents about Stack Overflow the company Business Learn more about hiring developers or posting ads command line redirect all output to file with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack command prompt redirect stderr Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Redirect stdout and stderr to a single file up vote 357 down https://support.microsoft.com/en-us/kb/110930 vote favorite 97 I'm trying to redirect all output (stdout + stderr) of a DOS command to a single file: C:\>dir 1> a.txt 2> a.txt The process cannot access the file because it is being used by another process. Is it possible, or should I just redirect to two separate files? windows command-line cmd pipe share|improve this question edited Oct 9 '15 at 19:39 Peter Mortensen 10.2k1369107 asked Sep http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file 14 '09 at 11:20 ripper234 66.3k165464747 2 TechNet: Using command redirection operators (answers this better than any of the answers here). –Martin Prikryl May 11 at 6:09 add a comment| 6 Answers 6 active oldest votes up vote 553 down vote accepted You want: dir > a.txt 2>&1 share|improve this answer answered Sep 14 '09 at 11:23 Anders Lindahl 24.7k55275 10 thanks for this, didn't know that this unix shell syntax works for DOS too! –chaindriver Aug 14 '12 at 17:00 11 this is great for hiding all output.. net stop w3svc >NUL 2>&1.. thanks! –wasatchwizard Apr 4 '13 at 17:55 1 @wasatchwizard Ithink I had trouble with that, but >NUL 2>NUL worked fine –FrinkTheBrave Aug 4 '14 at 8:24 4 If there is a Handle, there cannot be a space between the Handle (i.e. 2) and the redirect operator (i.e. >). Therefore 2> 2.txt works (or 2> &1) 2 > 2.txt does not; 2 > &1 does not. –The Red Pea Apr 3 '15 at 21:41 Reference document from Microsoft: support.microsoft.com/en-us/kb/110930 –Jonathan Benn Feb 3 at 18:58 | show 1 more comment up vote 101 down vote Anders Lindahl's answer is correct, but it should be not
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 http://askubuntu.com/questions/625224/how-to-redirect-stderr-to-a-file 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 How to command line redirect stderr to a file up vote 7 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 3861618 command line redirect add a comment| 1 Answer 1 active oldest votes up vote 12 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♦ 41.8k686152 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 |& inst