A safer way to redirect STARTed commands' output would be to create and run a "wrapper" batch file that handles the redirection. Ok, now that we get the idea of this concept of "streams", let's play with it. Probably the most familiar example is MORE: DIR /S | MORE where the MORE command accepts DIR's Standard Output at its own Standard Input, chops the stream in blocks of 25 What will likely happen is: 1 The output sent to one of the redirections will be captured or partially captured, and the output sent to other redirection will be lost. 2 http://introbuilder.net/batch-file/windows-batch-error-output-redirect.php
Why is this C++ code faster than assembly Reverse Lookup: getting keys from values Interlace strings Why didn’t Japan attack the West Coast of the United States during World War II? One method is to enclose the entire block of redirected commands within parentheses and redirect outside the parentheses >stdout.log 2>&1 ( echo Some text a.exe b.exe c.exe ) Another option is The maximum number of consecutive pipes is 2042 Examples: DIR >MyFileListing.txt DIR /o:n >"Another list of Files.txt" DIR C:\ >List_of_C.txt 2>errorlog.txt DIR C:\ >List_of_C.txt & DIR D:\ >List_of_D.txt ECHO y| DEL It may not be noticable for a few redirected commands, but if done in a loop with many iterations, it can become quite significant.
In Windows NT4 and later (CMD.EXE) and in OS/2 (also CMD.EXE) Standard Error can be redirected by using 2> instead of > A short demonstration. Does it make sense for these space ships to have turrets? net stop w3svc >NUL 2>&1.. The regular output is sent to Standard Out (STDOUT) and the error messages are sent to Standard Error (STDERR).
Use 1>&2 to send text to Standard Error. Note however, that a space between an ECHO command and a > will be redirected too. How common is it to use the word 'bitch' for a female dog? Windows Tee Redirecting Standard Error in "true" MS-DOS (COMMAND.COM) isn't possible (actually it is, by using the CTTY command, but that would redirect all output including Console, and input, including keyboard).
A CMD error is an error raised by the command processor itself rather than the program/command. Is it possible, or should I just redirect to two separate files? However, when I try to send the output to a file, the only thing I get is this: 'c:/Program' is not recognized as an internal or external command, operable program or anchor Word/phrase/idiom for person who is no longer deceived In the future, around year 2500, will only one language exist on earth?
Using Elemental Attunement to destroy a castle What commercial flight route has the biggest number of (minimum possible) stops/layovers from A to B? Batch File Logging Thinking that it could be the path (which is c:\Program Files (x86)\ and so on) which is misinterpreted, I tried specifying the output file like so: foo.exe > c:\test.txt, but still The “Standard In” file, known as stdin, contains the input to the program/script. It is not ok to use spaces in >> or 2> or 2>&1 or 1>&2 (before or after is ok).
Edit: Pacerier asked: Is there any difference between foo.exe > "c:\output.txt" 2>&1 and foo.exe > "c:\output.txt" 2>"c:\output.txt"? my site We'll see how we can use this later. Windows Command Line Redirect Output To File And Screen SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout. Batch File Redirect Output To File If you want stderr to go somewhere else, you can't join it with stdout first. –cp.engr Feb 3 at 1:07 | show 5 more comments up vote 44 down vote While
Stream 1 is referred to as STDOUT or Standard-Output. navigate here From http://support.microsoft.com/kb/110930: When redirecting output from an application using the ">" symbol, error messages still print to the screen. Miscellaneous Tweaks Web Stuff Conversions My Photo Galleries About This Site Disclaimer News FAQ Search What's New Objective Site Policy Your Preferences Credits The Making Of... It takes time to intialize the redirection. Windows Stderr
And "2>&1" causes the output for "stream 2" ("error output") to be sent through the already redirected "stream 1", and to also be captured to the (same) file. This can be selected by launching CMD /A or CMD /U With the default settings a UCS-2 file can be converted by redirecting it (note it's the redirection not the TYPE/MORE It's the same as if you typed it like this: foo.exe 1> "c:\Program Files (x86)\something\test.txt" This tells the command interpreter (cmd.exe) to capture the program output for STDOUT (Stream 1) to Check This Out Try this command: ECHO Hello world 2>NUL What you should get is: Hello world You see?
A common technique is to use > to create/overwrite a log file, then use >> subsequently to append to the log file. Note: Be careful when using workarounds like these, they may be broken in future (or even past) Windows versions. There is another stream, Standard Input: many commands accept input at their Standard Input instead of directly from the keyboard. Batch File Output To Text File Append Run: test.bat > NUL and you should see: C:\>test.bat This text goes to Standard Error This text goes to the Console C:\>_ We redirected Standard Output to the NUL device, and
When you are done typing, hit CTRL+Z, which sends the end-of-file (EOF) character. So the interpretation of the parenthesis and redirection is delayed, or deferred. Advisor professor asks for my dissertation research source-code What's this I hear about First Edition Unix being restored? this contact form windows command-line cmd pipe share|improve this question edited Oct 9 '15 at 19:39 Peter Mortensen 10.3k1369107 asked Sep 14 '09 at 11:20 ripper234 67.3k172467750 3 TechNet: Using command redirection operators
commandN ) Another good way @echo off call :sub >output.txt exit /b :sub command1 command2 ... To prevent this ambiguity, either use parentheses or insert an extra space yourself: ECHO Hello World2 >file.txt
(ECHO Hello World2)>file.txt "Merging" Standard Output and Standard Error with 2>&1 can also