#print
The "ls" command may be given with one
or more file names.  In that case,
it will tell which which of the files exist.
How many of the files "doug", "dave", and
"dennis" exist in this directory?  Find out
and then type "answer N" where N is the number
you found.
#create dennis
#create doug
#copyin
#user
#uncopyin
#match 2
#log
#next
5.1a  10