terminal
root@cheat
umount
Unmount a filesystem. Safely detaches a storage device from the directory tree before removal.
$ sudo umount /mnt/usb
sudo umount -l /mnt/stuck
disk
mount
Mount a filesystem or show currently mounted filesystems. Attaches storage devices to the directory tree.
$ sudo mount /dev/sdb1 /mnt/usb
mount | grep ext4
disk
du
Show disk usage of each file/folder in current directory
$ du -sh /var/log/*
disk
df
Display disk space usage in human-readable format
$ df -h /dev/sda1
disksystem