I am sorry to reply late. When i put "q()" in my script and run this, the default should be "Save workspace image to ~/.RData? [y/n/c]: " But in my console, the message is "Save workspace image to ~/.RData? [y/n]: ", there is no "c" which is cancel. i know the q() is a code which closes R session but i am curious about why there is no "c"