#yum install firefox

Loaded plugins: fastestmirror
Existing lock /var/run/yum.pid: another copy is running as pid 7426.
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:07 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:09 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:11 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:13 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:15 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:17 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:19 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:21 ago
    State  : Sleeping, pid: 7426
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum-updatesd-he
    Memory :  21 M RSS (278 MB VSZ)
    Started: Fri Apr  1 16:31:09 2011 - 07:23 ago
    State  : Sleeping, pid: 7426
Exiting on user cancel.