Fuser and df & du command

 Fuser command used

[root@dev ~]# fuser -cu linux
/root/linux:         23963c(root)

Note :- It is show how many user used this directory  

[root@dev ~]# fuser  -ck linux
/root/linux:         23963c

Note :- forcefully kill user and log out 

To view the usage information of mounted partition:

[root@dev ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 1.9G     0  1.9G   0% /dev
tmpfs                    1.9G   34M  1.9G   2% /run
tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   38G  4.6G   33G  13% /
/dev/sda1               1014M  149M  866M  15% /boot
/dev/mapper/centos-home   19G   33M   19G   1% /home
/dev/sdb1                2.0G  6.0M  1.8G   1% /root/linux

[root@dev ~]# cd /etc

[root@dev ~]# du -h 

size :  1.9G