Show free space of storage on Linux

$ df

Filesystem     1K-blocks    Used Available Use% Mounted on

udev              998984       0    998984   0% /dev

tmpfs             203840    8408    195432   5% /run

/dev/xvda1      49563892 3523424  43499720   8% /

tmpfs            1019184       0   1019184   0% /dev/shm

tmpfs               5120       0      5120   0% /run/lock

tmpfs            1019184       0   1019184   0% /sys/fs/cgroup

tmpfs             203944       0    203944   0% /run/user/1000

tmpfs             203944       0    203944   0% /run/user/1001

$ df -h

Filesystem      Size  Used Avail Use% Mounted on

udev            976M     0  976M   0% /dev

tmpfs           200M  8.3M  191M   5% /run

/dev/xvda1       48G  3.4G   42G   8% /

tmpfs           996M     0  996M   0% /dev/shm

tmpfs           5.0M     0  5.0M   0% /run/lock

tmpfs           996M     0  996M   0% /sys/fs/cgroup

tmpfs           200M     0  200M   0% /run/user/1000

tmpfs           200M     0  200M   0% /run/user/1001

$ 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:

Full documentation at:

or available locally via: info '(coreutils) df invocation'