CentOS7 yum安装软件提示:
another app is currently holding the yum lock;waiting for it to exit
yum在锁定状态中。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。
转载：
https://blog.csdn.net/u011781521/article/details/52950254
