4.3.1. df — report disk usage

The df command will report used and available disk space on all storage devices connected to the system.

For example, to find the amount of disk space used in / — the root filesystem, you can use the command:

df -h /

Output:

Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/vgmint-root   28G  6.9G   20G  26% /

The -h option makes the output human-readable. Without this, available disk space will be reported as 20600196 instead of 20G.