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Cmd Append Output To File



When appending to a file using Windows batch commands, how to append immediately after the next word in the file? For example, these commands echo here is the date of > c: arun.txt date /t &g. Jun 28, 2012  I'm trying to generate a log file (text file) that is appended to every time I run a batch file. It will enable me to see a history of my network problems. I have two questions: 1) How can I get the date and time to append on one line of the text file. I am currently using date /t output.txt & time /t output.

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Active17 days ago

I'm trying to redirect all output (stdout + stderr) of a DOS command to a single file:

Is it possible, or should I just redirect to two separate files?

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davidism
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ripper234Piperipper234
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8 Answers

Autocad nut and bolt drawings. You want:

The syntax 2>&1 will redirect 2 (stderr) to 1 (stdout). You can also hide messages by redirecting to NUL, more explanation and examples on MSDN.

Abel
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Anders LindahlAnders Lindahl
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Anders Lindahl's answer is correct, but it should be noted that if you are redirecting stdout to a file and want to redirect stderr as well then you MUST ensure that 2>&1 is specified AFTER the 1> redirect, otherwise it will not work.

JL2210
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DelboyJayDelboyJay
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While the accepted answer to this question is correct, it really doesn't do much to explain why it works, and since the syntax is not immediately clear I did a quick google to find out what was actually going on. In the hopes that this information is helpful to others, I'm posting it here.

Taken from MS Support KB 110930.

Summary

When redirecting output from an application using the '>' symbol, error messages still print to the screen. This is because error messages are often sent to the Standard Error stream instead of the Standard Out stream.

Output from a console (Command Prompt) application or command is often sent to two separate streams. The regular output is sent to Standard Out (STDOUT) and the error messages are sent to Standard Error (STDERR). When you redirect console output using the '>' symbol, you are only redirecting STDOUT. In order to redirect STDERR you have to specify '2>' for the redirection symbol. This selects the second output stream which is STDERR.

Example

The command dir file.xxx (where file.xxx does not exist) will display the following output:

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If you redirect the output to the NUL device using dir file.xxx > nul, you will still see the error message part of the output, like this:

To redirect (only) the error message to NUL, use the following command:

Or, you can redirect the output to one place, and the errors to another.

You can print the errors and standard output to a single file by using the '&1' command to redirect the output for STDERR to STDOUT and then sending the output from STDOUT to a file:

StormeHawkeStormeHawke
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To add the stdout and stderr to the general logfile of a script:

Henk WiersemaHenk Wiersema

Correct, file handle 1 for the process is STDOUT, redirected by the 1> or by > (1 can be omitted, by convention, the command interpreter [cmd.exe] knows to handle that).File handle 2 is STDERR, redirected by 2>.

Note that if you're using these to make log files, then unless you're sending the outut to _uniquely_named_ (eg date-and-time-stamped) log files, then if you run the same process twice, the redirected will overwrite (replace) the previous log file.

The >> (for either STDOUT or STDERR) will APPEND not REPLACE the file. So you get a cumulative logfile, showwing the results from all runs of the process - typically more useful.

Dos Pipe Command

Happy trails..

Shell Append Command Output To File

falsetru
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Max VitesseMax Vitesse

I just chopped out the answer as @Anders just posted it, but..

From my Windows help, I searched on redirection (URL ms-its:C:WINDOWSHelpntcmds.chm::/redirection.htm).

You may want to read about >> and | (pipe), too.

Peter Mortensen
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ericpericp

Command Prompt Append Output To File

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There is, however, no guarantee that the output of SDTOUT and STDERR are interweaved line-by-line in timely order, using the POSIX Best friends forever download game. redirect merge syntax.

If an application uses buffered output, it may happen that the text of one stream is inserted in the other at a buffer boundary, which may appear in the middle of a text line.

A dedicated console output logger (I.e. the 'StdOut/StdErr Logger' by 'LoRd MuldeR') may be more reliable for such a task.

See: MuldeR's OpenSource Projects

LigHLigH

In a batch file (Windows 7 and above) I found this method most reliable

Append Command Output To File Powershell

Obviously, use whatever commands you want and the output will be directed to the text file.Using this method is reliable HOWEVER there is NO output on the screen.

PanamaPHatPanamaPHat

Append Command Output To File Windows

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