What do the & and | operators do in a batch file?

Posted by Sam on Stack Overflow See other posts from Stack Overflow or by Sam
Published on 2010-06-15T17:46:50Z Indexed on 2010/06/15 17:52 UTC
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Windows

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batch

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

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