A whitespace-separated list of file names and wildcard patterns that CVS should ignore. (See also the -I option to the import command.)
This variable is appended last to the ignore list during a command. The
list is built up in this order: CVSROOT/cvsignore, the
.cvsignore file in your home directory, the
variable, any -I command option, and finally the contents of
.cvsignore files in the working copy used as CVS works in each
! as the ignore specification at any point
nullifies the entire ignore list built up to that point.