You can see the status of the file by using the status or stat command:
cvs status foo.c
This gives output similar to the following:
=================================================================== File: foo.c Status: Up-to-date Working revision: 1.1 Tue Jun 3 17:14:55 2003 Repository revision: 1.1 /home/fred/cvs/myproj/foo.c,v Sticky Tag: (none) Sticky Date: (none) Sticky Options: (none)