[jcp@nb-invoice1 jcp]$ cat 1 2 3
123
234
456
[jcp@nb-invoice1 jcp]$ ls
1  2  3
[jcp@nb-invoice1 jcp]$ grep -vl 1 *
2
3
[jcp@nb-invoice1 jcp]$ grep --version
GNU grep 2.6.3



jcp@dodge:~/t $ cat 1 2 3
123
345
888
jcp@dodge:~/t $ grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

jcp@dodge:~/t $ grep -vl 3 *
3
jcp@dodge:~/t $ grep -vl 2 *
2
3