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

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

@nemac -f Mesophile / E2> And 1. What does it do?
I know what does @nmake -f messphile / e and I know that tee% LOGFILEPATH% does, but let me know 2 & Gt; & Amp; 1; Can not get anything from the instrument. Thanks

2> & Amp; 1 redirects the standard error to the standard out.

| Pipe output from nmake to tee .


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