:w /* save not exit */
:w newfilename /* save as use name "newfilename" */
:q /* exit, only the file not changed */
:q! /* exit not save file, all change will been give up */
:w /* save not exit */
:w newfilename /* save as use name "newfilename" */
:q /* exit, only the file not changed */
:q! /* exit not save file, all change will been give up */