l13.1g

<B>Digital的Unix操作系统VAX 4.2源码</B>

#print
Suppose that we really do want to interchange the contents
of the files "dick" and "jane". One way to do it is
to move the contents of "dick" into some temporary file,
then move "jane" onto "dick" (which of course clobbers
the old contents of "dick", but we saved them already),
then finally to move the temporary copy of "dick" to
"jane". There are two files named "dick" and "jane" in this
directory. Interchange their contents, then type "ready".
#create Ref
short file for dick
#create dick
short file for dick
#create jane
another file for jane
#create Ref1
another file for jane
#user
cmp -s jane Ref || cmp -s dick Ref1
#log