another app is currently holding the yum lock;waiting for it to exit 解决办法
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...
可以通过强制关掉yum进程：
#rm -f /var/run/yum.pid
然后就可以使用yum了。
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