Problem with co/ci

[Pham, Khue D]

Below is what I did.  Please let me know what went wrong.

THanks.

bash$ co -l passwd
passwd,v  -->  passwd
revision 1.19 (locked)
writable passwd exists; remove it? [ny](n): y
done


modify the passwd file


bash$ ci -u passwd
passwd,v  <--  passwd
new revision: 1.20; previous revision: 1.19
enter log message, terminated with single '.' or end of file:
>> .
UX:diff: ERROR: Illegal option -- a
UX:diff: TO FIX: Usage:
        diff [ -bcefhilnrstw -C num -D string -S name ] file1 file2
ci: passwd,v: diff failed
ci aborted

[ K.P. ]