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Vi comment out block / VI comment multiple lines

Go to the line and hit

1) m{CHAR} or m{a}
2) put e mark in m{CHAR} in the end of the line

When you have marked a with start of line and e with end of line
3) :’a,’e s/^/# /

You can also use line numbers,
1 to $ ($ is the last line)
solitary % for everyline
. or blank for the current line.
To illustrate the “blank”, these two commands do the same thing:

:,$ s/^/# /
:.,$ s/^/# /