Show free space of storage on Linux

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$ 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'

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