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I'm debugging a batch file left behind by an old employee and I've come across the line: 

@nmake -f makefile /E 2>&1 | tee %LOGFILEPATH%

What does this do?
I know what @nmake -f makefile /E does and I know what tee %LOGFILEPATH% does, but I can't find anything on what the 2>&1 | means.
Thanks

Dasmowenator
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  • @See http://www.robvanderwoude.com/redirection.php and http://www.robvanderwoude.com/battech_redirection.php – BalusC Jun 15 '10 at 17:50

2 Answers2

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2>&1 redirects standard error to standard out.

| pipes the output from nmake into tee.

Richard Fearn
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2

2>&1 redirects the standard error stream to standard output.

The pipe | redirects standard output of the first command to the standard input to the second command.

So your command, bunches all output from nmake and redirects it all to tee

Ben S
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