# kak > Kakoune is a mode-based code editor implementing the "multiple selections" paradigm. > Data can be selected and simultaneously edited in different locations, using multiple selections; users can also connect to the same session for collaborative editing. > More information: <https://kakoune.org>. - Open a file and enter normal mode, to execute commands: `kak {{path/to/file}}` - Enter insert mode from normal mode, to write text into the file: `i` - Escape insert mode, to go back to normal mode: `<Esc>` - Replace all instances of "foo" in the current file with "bar": `%s{{foo}}<Enter>c{{bar}}<Esc>` - Unselect all secondary selections, and keep only the main one: `<Space>` - Search for numbers and select the first two: `/\d+<Enter>N` - Insert the contents of a file: `!cat {{path/to/file}}<Enter>` - Save the current file: `:w<Enter>`