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df

disk free

display free disk space

report file system disk space usage

References

  • man df

Quickstart

df -h   # Display in human readable format
df -H   # Likewise, but use powers of 1000 not 1024

Options

  • -a, --all Include dummy file systems
  • -h, --human-readable Print sizes in human readable format (e.g., 1K 234M 2G)
  • -H, --si Likewise, but use powers of 1000 not 1024
  • -T, --print-type Print file system type

Usage

Print in KB, GB, TB…

$ df -h
Filesystem     Size  Used Avail Capacity  iused               ifree %iused  Mounted on
/dev/disk1s1  466Gi 355Gi 109Gi    77%  3484707 9223372036851291100    0%   /
devfs         344Ki 344Ki   0Bi   100%     1191                   0  100%   /dev
/dev/disk1s4  466Gi 1.0Gi 109Gi     1%        2 9223372036854775805    0%   /private/var/vm
map -hosts      0Bi   0Bi   0Bi   100%        0                   0  100%   /net
map auto_home   0Bi   0Bi   0Bi   100%        0                   0  100%   /home
/dev/disk2s4  454Gi 128Gi 326Gi    29%      355          4294966924    0%   /Volumes/IceHe_何志远

Print in KiB, GiB, TiB…

$ df -H
Filesystem     Size   Used  Avail Capacity  iused               ifree %iused  Mounted on
/dev/disk1s1   500G   381G   117G    77%  3484687 9223372036851291120    0%   /
devfs          352k   352k     0B   100%     1191                   0  100%   /dev
/dev/disk1s4   500G   1.1G   117G     1%        2 9223372036854775805    0%   /private/var/vm
map -hosts       0B     0B     0B   100%        0                   0  100%   /net
map auto_home    0B     0B     0B   100%        0                   0  100%   /home

Print with Type

$ df -hT
Filesystem Type     Size Used Avail Use% Mounted on
/dev/sda3  ext4     3.9G 365M  3.3G  10% /
devtmpfs   devtmpfs 5.8G    0  5.8G   0% /dev
tmpfs      tmpfs    5.8G    0  5.8G   0% /dev/shm
tmpfs      tmpfs    5.8G 642M  5.2G  11% /run
tmpfs      tmpfs    5.8G    0  5.8G   0% /sys/fs/cgroup
/dev/sda1  ext4      12G 3.9G  7.3G  35% /usr
/dev/sdb1  ext4     134G  99G   29G  78% /data1
/dev/sda7  ext4     235G 101G  122G  46% /data0
/dev/sda5  ext4     7.8G  37M  7.3G   1% /tmp
/dev/sda6  ext4     7.8G 509M  6.9G   7% /var
overlay    overlay  235G 101G  122G  46% /data0/docker-1.13.1-fs/overlay/64fce5a854ba98f1dac917735fd4531bac33c29378a29d4523a283dbd5bd605b/merged
shm        tmpfs     64M    0   64M   0% /data0/docker-1.13.1-fs/containers/dc50f340afd86e2e93dbc0c76d36bb5379288d64e9f6eb23bb29b19a1633ba33/shm
……

KiB & KB

In short

  • kilo- = 1,000
  • kibi- = 1,024 = kilo binary
  • mebi- = 1,024 * 1024 = mega binary
  • …

Format

  • 10^3 means 103
  • ( 2^10 )^3 means (210)3

Derivations

  • kilo : ( 10^3 )^1
  • mega : ( 10^3 )^2
  • giga : ( 10^3 )^3
  • tera : ( 10^3 )^4
  • peta : ( 10^3 )^5
  • exa : ( 10^3 )^6

SI prefixes

  • 1 KB = 1,000 Byte = 10^3 Byte
  • 1 MB = 1,000 KB = 10^3 KB
  • 1 GB = 1,000 MB = 10^6 KB = 1,000,000 KB
  • 1 TB = 1,000 GB = 10^9 KB = 1,000,000,000 KB
  • …

IEC prefixes

  • 1 KiB = 1,024 Byte = 2^10 Byte
  • 1 MiB = 1,024 KiB = 2^20 KB
  • 1 GiB = 1,024 MiB = 2^30 KB = 1,048,576 KiB
  • 1 TiB = 1,024 GiB = 2^40 KB = 1,073,741,824 KiB
  • …

References