刚安装完虚拟机，用xshell连接上linux后，安装程序时一直出现这个信息Another app is currently holding the yum lock; waiting for it to exit...
解决方法：
rm -rf /var/run/yum.pid 来强行解除锁定，然后你的yum就可以运行了
可以看博文
http://www.cnblogs.com/IceKernel/articles/2587274.html
Another app is currently holding the yum lock; waiting for it to exit...
原文：http://www.cnblogs.com/zhaoshunjie/p/5823975.html