Is there a shortcut for selecting word under cursor in Sublime Text, Atom

You can add a key binding to select the word:

{ "keys": ["ctrl+shift+w"], "command": "expand_selection", "args": {"to": "word"} }

Unlike the find_under_expand command (control+d by default) repeated presses won't add cursors at matching words.

command+d on OSX

control+d on Windows/Linux

You can find all the default keybindings by going to Preferences > Keybindings - Default and perusing the list.

install ExpandRegion if you want to expand the selection:

• Expand selection to word
• Expand selection to quotes (content only)
• Expand selection to quotes (with quotes)
• Expand selection to complete self closing tag
• Expand selection to parent node content
• Expand selection to complete node
• Expand selection to parent node content