umount /mnt/net1
umount: /mnt/net1: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
这种问题解决方案:
一、查找使用这个文件的进程和命令,具体的操作代码
[root@localhost ~]# lsof |grep /mnt/net1
lsof: WARNING: can't stat() cifs file system /mnt/net1
Output information may be incomplete.
bash 18841 root cwd unknown /mnt/net1/TDDOWNLOAD/软件 (stat: No such device)