It's the method of saving and exiting a text file in Vim. ':' enters command input mode, 'w' writes to disk and 'q' quits the program. These people mistakenly t

It's the method of saving and exiting a text file in Vim. ':' enters command input mode, 'w' writes to disk and 'q' quits the program. These people mistakenly typed and saved it in non-vim-edited text files.