Re: [PATCH v2] rebase -i: respect core.commentchar

John Keeping [off-list ref] writes:

quoted

I am not sure if I understand what you meant by "literal backslash
blah blah", though.

It turns out that having this in the script works (in bash and dash
although I haven't checked what Posix has to say about it):

    sed -e "2,$ s/^/\\\/"

and is equivalent to:

    sed -e '2,$ s/^/\\/'

because backslashes that aren't recognised as part of an escape sequence
are not treated specially.

That's POSIX.  Inside a dq pair:

        \
        The <backslash> shall retain its special meaning as an escape
        character (see Escape Character (Backslash)) only when followed by
        one of the following characters when considered special:
        $   `   "   \   <newline>

So in your example "\\\/", the first backslash escapes the second
backslash and together they produce a single backslash, the third
backslash is followed by a slash that is not special at all, so it
produces a second backslash, and the slash stands for itself,
resulting in "\\/".