yum命令用ctrl+z命令中断后，再运行yum时，出现：
Existing lock /var/run/yum.pid: anothercopyis running as pid 3046.
Another app is currently holding theyumlock; waiting for it to exit...
Another app is currently holding theyumlock; waiting for it to exit...
Another app is currently holding theyumlock; waiting for it to exit...
Another app is currently holding theyumlock; waiting for it to exit...
Another app is currently holding theyumlock; waiting for it to exit...
NND，说我正在使用yum。输入
rm-f /var/run/yum.pid
/sbin/serviceyum-updatesd restart

Stoppingyum-updatesd: [ OK ]
Startingyum-updatesd: [ OK ]

好了，一切正常了

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