#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 - 06:26 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 - 06:28 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 - 06:30 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 - 06:32 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 - 06:34 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 - 06:36 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 - 06:38 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 - 06:40 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 - 06:42 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 - 06:44 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 - 06:46 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 - 06:48 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 - 06:50 ago
    State  : Sleeping, pid: 7426
Exiting on user cancel.