We have also provided @command{pwd}, which is not so straightforward.
The @command{shell} program implements @command{cd} internally.
-The @code{pintos} @option{put} and @option{get} commands should now
+The @code{pintos} @option{extract} and @option{append} commands should now
accept full path names, assuming that the directories used in the
paths have already been created. This should not require any significant
extra effort on your part.