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What's the equivalent of # for Windows cmd console sessions, to create a comment?

The operating system is Windows XP.

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Note that cmd.exe in Windows is not DOS - it's a full Windows application which just has a similar syntax to that of command.com –  grawity Dec 12 '09 at 11:53

2 Answers 2

up vote 24 down vote accepted

REM is the standard way:

REM this is a comment

You could also use the double-colon convention commonly seen in batch files:

:: another comment

A single colon followed by a string is a label, but a double colon and anything after it are silently ignored. One could argue that this form is more legible than the REM command.

Note that both of these methods only work at the beginning of a line. If you want to append a comment to a command, you can use them with the command concatenation character (&), like this:

dir & REM a comment
dir &:: another one
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Thanks. Does this only work if it's the first thing encountered, as opposed to doing something like dir :: comment? –  Andrew Grimm Dec 12 '09 at 9:53
@Andrew Grimm, good point. See my update. –  efotinis Dec 12 '09 at 10:16
First an useful link. Then, double colon comments doesn't seem to work inside code blocks (code between parentheses, like in if/for loops). –  x-yuri Jun 20 at 11:54

You prefix your comment with the word REM.

REM This is a comment.

But if you want your comment printed back to you, you should echo it:

echo This is a comment you'll see.
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Accepting as working, but I'd only have been slightly more surprised if the answer was BTW, like in lolcode.com/specs/1.2#comments –  Andrew Grimm Dec 12 '09 at 8:06

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