System administration

Linux df command

Show available and used disk space for mounted filesystems.

Availability: Common Linux commands; shell built-ins and external implementations may differ by distribution.中文

Syntax

df [OPTION]... [FILE]...

Examples

Show mounted filesystems, types and readable capacity.

df -hT

Check inode usage for the filesystem containing /var.

df -i /var

Parameters, options and clauses

Option / clause	Description
`-h, --human-readable`	Show sizes in powers of 1024 with readable units.
`-H, --si`	Show sizes in powers of 1000.
`-T, --print-type`	Include filesystem type.
`-i, --inodes`	Show inode usage instead of block usage.
`-P, --portability`	Use the POSIX output format.
`--total`	Display a grand total where applicable.

Safety note

Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.

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