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RedHat 9 (Linux i386) - man page for kdestroy (redhat section 1)

KDESTROY(1)						      General Commands Manual						       KDESTROY(1)

NAME
kdestroy - destroy Kerberos tickets
SYNOPSIS
kdestroy [-5] [-4] [-q] [-c cache_name]
DESCRIPTION
The kdestroy utility destroys the user's active Kerberos authorization tickets by writing zeros to the specified credentials cache that contains them. If the credentials cache is not specified, the default credentials cache is destroyed. If kdestroy was built with Kerberos 4 support, the default behavior is to destroy both Kerberos 5 and Kerberos 4 credentials. Otherwise, kdestroy will default to destroying only Kerberos 5 credentials.
OPTIONS
-5 destroy Kerberos 5 credentials. This overrides whatever the default built-in behavior may be. This option may be used with -4 -4 destroy Kerberos 4 credentials. This overrides whatever the default built-in behavior may be. This option is only available if kinit was built with Kerberos 4 compatibility. This option may be used with -5 -q Run quietly. Normally kdestroy beeps if it fails to destroy the user's tickets. The -q flag suppresses this behavior. -c cache_name use cache_name as the credentials (ticket) cache name and location; if this option is not used, the default cache name and location are used. The default credentials cache may vary between systems. If the KRB5CCNAME environment variable is set, its value is used to name the default ticket cache. Most installations recommend that you place the kdestroy command in your .logout file, so that your tickets are destroyed automatically when you log out.
ENVIRONMENT
Kdestroy uses the following environment variables: KRB5CCNAME Location of the Kerberos 5 credentials (ticket) cache. KRBTKFILE Filename of the Kerberos 4 credentials (ticket) cache.
FILES
/tmp/krb5cc_[uid] default location of Kerberos 5 credentials cache ([uid] is the decimal UID of the user). /tmp/tkt[uid] default location of Kerberos 4 credentials cache ([uid] is the decimal UID of the user).
SEE ALSO
kinit(1), klist(1), krb5(3)
BUGS
Only the tickets in the specified credentials cache are destroyed. Separate ticket caches are used to hold root instance and password changing tickets. These should probably be destroyed too, or all of a user's tickets kept in a single credentials cache. KDESTROY(1)