Dos Pipe Standard Error
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Pipe Standard Error To Grep
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Pipe Standard Error Into Standard Out
policies of this site About Us Learn more about Stack Overflow the how to pipe standard error linux company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags dos redirect stderr Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes https://support.microsoft.com/en-us/kb/110930 a minute: Sign up Redirect stdout and stderr to a single file up vote 358 down 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 http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file 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 14 '09 at 11:20 ripper234 66.4k165464747 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
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 http://superuser.com/questions/452763/how-to-pipleline-stderr-in-cmd-exe ads with us Super User Questions Tags Users Badges Unanswered Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Sign up Here's how it works: Anybody can http://www.diveintopython.net/scripts_and_streams/stdin_stdout_stderr.html ask a question Anybody can answer The best answers are voted up and rise to the top How to pipleline stderr in cmd.exe? up vote 2 down vote favorite Some programs would prefer to output the help message in stderr. I standard error want to search the help message with grep command, xx /? | grep regex? How could i do this? windows command-line grep share|improve this question asked Jul 24 '12 at 3:30 Jichao 1,85072846 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted You can redirect stderr to stdout by using 2>&1, and then pipe stdout into grep. So, what I think you want is this: xx /? 2>&1 | grep regex share|improve this answer answered Jul 24 '12 pipe standard error at 4:03 martineau 3,2151124 what does &1 means? –Jichao Jul 24 '12 at 5:00 1 To specify redirection to existing handles, use the ampersand & character followed by the handle number that you want to redirect (that is, &handle#). stdin is handle #0, stdout is handle #1, and stderr is handle #2. –martineau Jul 24 '12 at 5:12 add a comment| You must log in to answer this question. Not the answer you're looking for? Browse other questions tagged windows command-line grep . asked 4 years ago viewed 1173 times active 4 years ago Related 0How to search for files and directories using a single find command2How do I grep help output in linux?0How to use Grep in Unix command line?4How to quickly save what is currently shown in cmd.exe to a file5output both stderr and stdout to file, and only stderr to command prompt0How to redirect a part of stderr and stdout to /dev/null1How to redirect ALL output from a command in Linux0How do I correctly return context from a gnuwin32 grep (grep in windows cmd)?2How to use wmic to kill a cmd.exe instance searching by it's command line?0How to unbuffer stdout when piping commands in cmd.exe under Windows? Hot Network Questions How do I space quads evenly? If I'm traveling at the same direction and speed of the wind, will I still hear and feel it? Hypotheses for the likelihood ratio test Invariants of higher genus curves Unable to pass result of o
concept of standard input, standard output, and standard error. This section is for the rest of you. Standard output and standard error (commonly abbreviated stdout and stderr) are pipes that are built into every UNIX system. When you print something, it goes to the stdout pipe; when your program crashes and prints out debugging information (like a traceback in Python), it goes to the stderr pipe. Both of these pipes are ordinarily just connected to the terminal window where you are working, so when a program prints, you see the output, and when a program crashes, you see the debugging information. (If you're working on a system with a window-based Python IDE, stdout and stderr default to your "Interactive Window".) Example10.8.Introducing stdout and stderr >>> for i in range(3): ... print 'Dive in' Dive in Dive in Dive in >>> import sys >>> for i in range(3): ... sys.stdout.write('Dive in') Dive inDive inDive in >>> for i in range(3): ... sys.stderr.write('Dive in') Dive inDive inDive in As you saw in Example6.9, "Simple Counters", you can use Python's built-in range function to build simple counter loops that repeat something a set number of times. stdout is a file-like object; calling its write function will print out whatever string you give it. In fact, this is what the print function really does; it adds a carriage return to the end of the string you're printing, and calls sys.stdout.write. In the simplest case, stdout and stderr send their output to the same place: the Python IDE (if you're in one), or the terminal (if you're running Python from the command line). Like stdout, stderr does not add carriage returns for you; if you want them, add them yourself. stdout and stderr are both file-like objects, like the ones you discussed in Section10.1, "Abstracting input sources", but they are both write-only. They have no read method, only write. Still, they are file-like objects, and you can assign any other file- or file-like object to them to redirect their output. Example10.9.Redirecting output [you@localhost kgp]$ python stdout.py Dive in [you@localhost kgp]$ cat out.log This message will be logged instead of displayed(On Windows, you can use type instead of cat to display the contents of a file.) If you have not already done so, you can download this and other examples used in this book. #stdout.py import sys print 'Dive in' saveout = sys.stdout fsock = open('out.log', 'w') sys.stdout = fsock print 'This message will be logged instead of displayed' sys.stdout = saveout fsock.close() This will print to the IDE "Interactive Window" (or the terminal, if running t