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df (disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access.
~/codeFactory$ df --help
Usage: df [OPTION]... [FILE]...
Show information about the file system on which each FILE resides,
or all file systems by default.
Mandatory arguments to long options are mandatory for short options too.
-a, --all include pseudo, duplicate, inaccessible file systems
-B, --block-size=SIZE scale sizes by SIZE before printing them; e.g.,
'-BM' prints sizes in units of 1,048,576 bytes;
see SIZE format below
-h, --human-readable print sizes in powers of 1024 (e.g., 1023M)
-H, --si print sizes in powers of 1000 (e.g., 1.1G)
-i, --inodes list inode information instead of block usage
-k like --block-size=1K
-l, --local limit listing to local file systems
--no-sync do not invoke sync before getting usage info (default)
--output[=FIELD_LIST] use the output format defined by FIELD_LIST,
or print all fields if FIELD_LIST is omitted.
-P, --portability use the POSIX output format
--sync invoke sync before getting usage info
--total elide all entries insignificant to available space,
and produce a grand total
-t, --type=TYPE limit listing to file systems of type TYPE
-T, --print-type print file system type
-x, --exclude-type=TYPE limit listing to file systems not of type TYPE
-v (ignored)
--help display this help and exit
--version output version information and exit
Display values are in units of the first available SIZE from --block-size,
and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables.
Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).
The SIZE argument is an integer and optional unit (example: 10K is 10*1024).
Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (powers of 1000).
FIELD_LIST is a comma-separated list of columns to be included. Valid
field names are: 'source', 'fstype', 'itotal', 'iused', 'iavail', 'ipcent',
'size', 'used', 'avail', 'pcent', 'file' and 'target' (see info page).
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report df translation bugs to <https://translationproject.org/team/>
Full documentation at: <https://www.gnu.org/software/coreutils/df>
or available locally via: info '(coreutils) df invocation'
Using df with options:
1. -a: If you want to display all the file system, use -a option.
~/codeFactory$ df -a
Filesystem 1K-blocks Used Available Use% Mounted on
overlay 123802992 7207272 116579336 6% /
proc 0 0 0 - /proc
tmpfs 65536 0 65536 0% /dev
devpts 0 0 0 - /dev/pts
sysfs 0 0 0 - /sys
tmpfs 16442392 0 16442392 0% /sys/fs/cgroup
cgroup 0 0 0 - /sys/fs/cgroup/systemd
The above is not complete output, but you can see that the information shown is extended to info provided by df command.
2. -h: Use -h option to display size in power of 1024
~/codeFactory$ df -h /home/user/
Filesystem Size Used Avail Use% Mounted on
kucalc-default-project-bb39a15f-575d-4291-b496-fa0f9561e1c1 3.0G 256K 3.0G 1% /home/user
3. -H: Use -H option to display sizes in power of 1000
~/codeFactory$ df -H /home/user/
Filesystem Size Used Avail Use% Mounted on
kucalc-default-project-bb39a15f-575d-4291-b496-fa0f9561e1c1 3.2G 263k 3.2G 1% /home/user
4. –total: To get complete grand total, use –total option
~/codeFactory$ df --total
Filesystem 1K-blocks Used Available Use% Mounted on
overlay 123802992 7209120 116577488 6% /
tmpfs 65536 0 65536 0% /dev
tmpfs 16442392 0 16442392 0% /sys/fs/cgroup
10.105.159.225:/ubuntu2004_2021-09-07/linux/Ubuntu-20.04/bin 1119879168 969554944 117873664 90% /bin
tmpfs 16442392 32 16442360 1% /tmp
tmpfs 16442392 0 16442392 0% /data
kucalc-default-project-bb39a15f-575d-4291-b496-fa0f9561e1c1 3072000 256 3071744 1% /home/user
/var/lib/kubelet/pods/d8e4f834-ffc3-489c-8bfa-32f9005891d6/volumes/cocalc~zfs/home/.zfs/snapshot 3072000 256 3071744 1% /home/user/.snapshots
tmpfs 16442392 4 16442388 1% /secrets/secret-token
tmpfs 16442392 4 16442388 1% /secrets/gateway-public
/dev/sda1 123802992 7209120 116577488 6% /etc/hosts
shm 65536 0 65536 0% /dev/shm
tmpfs 16442392 0 16442392 0% /proc/acpi
tmpfs 16442392 0 16442392 0% /proc/scsi
tmpfs 16442392 0 16442392 0% /sys/firmware
total 1505299360 983973736 488842296 67% -
Observe the last row of above table output, it specifies grand total.
5. -T: Use -T option to display file type
~/codeFactory$ df -T /home/user/
Filesystem Type 1K-blocks Used Available Use% Mounted on
kucalc-default-project-bb39a15f-575d-4291-b496-fa0f9561e1c1 zfs 3072000 256 3071744 1% /home/user
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