Using Komodo I'd:

although that may not place the # as the first character of each line - it tends to follow indentation and will be the first non-whitespace character on each line

Update Actually ctrl-3 does place a comment character at the start of each selected line. I was confusing the behaviour with Visual Studio which tends to follow indentation when you use ctrl-k ctrl-c.

DWIM is Perl's answer to Gödel

In reply to Re^2: Adding '#' in the beginning of each line by GrandFather
in thread Adding '#' in the beginning of each line by Anonymous Monk

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