From LQWiki

df displays free disk space on each mounted volume. The tool displays the file system, total size, amount used and available, this information as a percentage, and the mount point.

Using the -h flag lists amounts in human-readable terms of "K" for kilobytes, "M" for megabytes and "G" for gigabytes, instead of numbers of blocks.

Example

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda2              74G   34G   41G  46% /
/dev/hdc1             150G   44G  106G  29% /bulk
shmfs                  94M     0   94M   0% /dev/shm

See also

• du - disk usage
• ls - directory listing