bash: chkconfig: command not found

[root@xuniji ~]# chkconfig
bash: chkconfig: command not found
[root@xuniji ~]# rpm -aq |grep chkconfig
chkconfig-1.3.30.1-2
[root@xuniji ~]# export PATH=/sbin:$PATH
[root@xuniji ~]# chkconfig
chkconfig version 1.3.30.1 - Copyright (C) 1997-2000 Red Hat, Inc.
This may be freely redistributed under the terms of the GNU Public License.

usage:   chkconfig --list [name]
         chkconfig --add <name>
         chkconfig --del <name>
         chkconfig [--level <levels>] <name> <on|off|reset|resetpriorities>

[root@xuniji ~]# echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/gtl/bin
[root@xuniji ~]# PATH="$PATH":/sbin
[root@xuniji ~]# echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/gtl/bin:/sbin