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Here are a couple of sites I have used in the past (and present for reference) to expand my knowledge of DOS BAT commands and techniques. &nbsp;Bookmark these for reference, and also check out the links related to this question.<br />
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<a href="http://ss64.com/" rel="ugc">http://ss64.com/</a><br />
<a href="http://ss64.com/nt/delayedexpansion.html" rel="ugc">http://ss64.com/nt/delayedexpansion.html</a><br />
<a href="http://ss64.org/viewtopic.php?id=985" rel="ugc">http://ss64.org/viewtopic.php?id=985</a><br />
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<a href="http://www.dostips.com/" rel="ugc">http://www.dostips.com/</a><br />
<a href="http://www.dostips.com/DtTutoFramework.php" rel="ugc">http://www.dostips.com/DtTutoFramework.php</a><br />
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<i><b>~bp</b></i>
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I've explained some of the context in my article <a href="https://www.experts-exchange.com/articles/673/Advanced-DOS-batch-pitfalls.html" rel="ugc">https://www.experts-exchange.com/articles/673/Advanced-DOS-batch-pitfalls.html</a>&nbsp;.
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May I ask what led you to grading with &quot;B&quot; only?
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I am very sorry. Must be a mistake since i was in a hurry! It was surely an &quot;A&quot;.
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setlocal ENABLEDELAYED EXPANSION - what does this actually do? <br />
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Can anyone help me understand in detail?
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setlocal ENABLEDELAYED EXPANSION - what does this actually do? 

Can anyone help me understand in detail?

setlocal ENABLEDELAYED EXPANSION

Batch files are text files containing a script of commands that are executed by the command interpreter on DOS, OS/2 and Windows systems. Most commonly, they are used to perform a series of functions that are repeated -- copying a set of files created daily with one step, for example.