# Print free disk space in a [h]uman-readable format.
df -h

# Free disk space for [t]ype EXT2 file systems.
df -t ext2

# Free disk space for filesystems, e[x]cluding EXT2.
df -x ext2

# Show [i]node usage.
df -i

# Show information about a distinct filesystem path.
df [PATH]

# List [a]ll filesystems, + unreadable, duplicates, pseudo, and inaccessible.
df -a