+Gives a listing of all files being edited.
+.IP check
+Like ``info''
+except that nothing is printed if nothing is being edited,
+and a non-zero exit status is returned if anything
+is being edited.
+The intent is to have this included in an ``install''
+entry in a makefile
+to insure that everything is included into the
+.SM SCCS
+file
+before a version is installed.