Shell command: df

df reports the amount of available space in the filesystems in which the files given as optional argument FILE to df reside.

If FILE is a mounted device node (eg /dev/nvme0n1p5), df` (intuitively) reports the figures for the mounted file system, not for the filesystem where that node is located.

If the argument FILE is not specified, df reports the sizes for all mounted devices.

Space is shown in 1K blocks, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used (but see also the environment variables DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE).

Options

`-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 be‐ low
`-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

FIELD_LIST

FIELD_LIST is a comma-separated list of column names. The possible namesare

source
fstype
itotal
iused
iavail
ipcent
size
used
avail
pcent
file
target

-T: determine file system

If df is given the -T flag, it additionally reports the file system type.

Determine the file system type of the current working directory

$ df --output=fstype . | tail -1
btrfs

Exclude temporary file systems

$ df -Th -x tmpfs