Keyboard shortcut to comment lines in Sublime Text 3

You can add the following lines to Preferences / Key Bindings - User:

{ "keys": ["control+keypad_divide"],"command": "toggle_comment", "args": {"block": false} }, 
{ "keys": ["shift+control+keypad_divide"],"command": "toggle_comment", "args": {"block": true}}

This is how I sorted the problem out - replacing "ctrl" with "control" and "/" with "keypad_divide".

It seems a bug: http://www.sublimetext.com/forum/viewtopic.php?f=3&t=11157&start=0

As a workaround, go to Preferences->Key Bindings - User and add these keybindings (if you're using Linux):

{ "keys": ["ctrl+7"], "command": "toggle_comment", "args": { "block": false } },
{ "keys": ["ctrl+shift+7"], "command": "toggle_comment", "args": { "block": true } }

Update: This also works on Windows 8 (see @Sosi's comment)

This is a keyboard internationalisation issue.

On a standard US QWERTY keyboard, as used in Australia where Sublime Text is made, / is readily available:

This is not the case with many other keyboards. Take for example the German QWERTZ keyboard. One needs to hit SHIFT+7 to get a /. This is why commenting does not work properly on these keyboards.

Changing the user keybindings to those listed below, will work for the German QWERTZ keyboard.

{ "keys": ["ctrl+7"], "command": "toggle_comment", "args": { "block": false } },
{ "keys": ["ctrl+shift+7"], "command": "toggle_comment", "args": { "block": true } }

If the problems are occurring with still a different keyboard layout, change the keybindings accordingly.

U can fix this bug by:

[
   { "keys": ["ctrl+keypad_divide"], "command": "toggle_comment", "args": { "block": false } },
   { "keys": ["ctrl+shift+keypad_divide"], "command": "toggle_comment", "args": { "block": true } },
]

it allow to comment with CTRL+/ and CTRL+SHIFT+/ and u can use / on keypad =)