another app is currently holding the yum lock;waiting for it to exit解决

有时用yum升级一些文件时，会出现以下情况：
another app is currently holding the yum lock;waiting for it to exit…

可以通过以下命令强制关掉yum进程：

# rm -f /var/run/yum.pid

然后就可以使用yum了。

done！