Toggle comment lines in Vim

Put your cursor on the first # character, press CtrlV (or CtrlQ for gVim), and go down until the last commented line and press x, that will delete all the # characters vertically.
For commenting a block of text is almost the same:
  1. First, go to the first line you want to comment, press CtrlV. This will put the editor in the VISUAL BLOCK mode.
  2. Then using the arrow key and select until the last line
  3. Now press ShiftI, which will put the editor in INSERT mode and then press #. This will add a hash to the first line.
  4. Then press Esc twice, and it will insert a # character on all other selected lines.
For the stripped-down version of vim shipped with debian/ubuntu by default, type : s/^/# in the third step instead.

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