/usr/bin/df

Usage: /usr/bin/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; see SIZE format below;
         E.g., '-BM' prints sizes in units of 1,048,576 bytes
  -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,R,Q (powers of 1024) or KB,MB,... (powers of 1000).
Binary prefixes can be used, too: KiB=K, MiB=M, and so on.

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).

Report bugs to: <bug-coreutils@gnu.org>.
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Full documentation <https://www.gnu.org/software/coreutils/df>
or available locally via: info '(coreutils) df invocation'