Another app is currently holding the yum lock;

[webice@localhost ~]$ sudo yum install update

[sudo] password for webice:

Loaded plugins: fastestmirror

Existing lock /var/run/yum.pid:

another copy is running as pid 4538.

Another app is currently holding the yum lock;

 waiting for it to exit...  

[webice@localhost ~]$ kill -9 4538 bash:

kill: (4538) - Operation not permitted

[webice@localhost ~]$ sudo kill -9 4538

[webice@localhost ~]$ sudo yum install update

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile  * base:

mirror.khlug.org  * extras: mirror.khlug.org  * updates:

mirror.khlug.org Setting up Install Process

No package update available.

Nothing to do