kdestroy destroys the user's active
tickets by writing zeros to the specified
credentials cache that contains them.
If the credentials cache is not
specified, kdestroy destroys the default credentials cache
(/tmp/krb5cc_UID where UID is the
decimal user ID).
-ccache
specify the credentials cache pathname.
The format of cache is FILE:filename.
Environment variables
KRB5CCNAME
alternate default cache
Files
/tmp/krb5cc_UID
default credentials cache
Limitations
Only the tickets in the user's current ticket file are destroyed.