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Shell command: numfmt

numfmt converts numbers from and/or to human readable representations: 
numfmt [OPTION]… [NUMBER]…

Options

--debug print warnings about invalid input
-d --delimiter= X use X instead of whitespace for field delimiter
--field= FIELD replace the numbers in these input fields (default=1).
--format=FORMAT use printf style floating-point FORMAT
--from=UNIT auto-scale input numbers to UNITs; UNIT is auto, si, iec or iec-i default is 'none'.
--from-unit=N specify the input unit size (instead of the default 1)
--grouping use locale-defined grouping of digits, e.g. 1,000,000 (which means it has no effect in the C/POSIX locale)
--header[=] N print (without converting) the first N header lines. N defaults to 1 if not specified
--invalid= MODE failure mode for invalid numbers. MODE is abort (default), fail, warn or ignore
--padding= N pad the output to N characters; positive N will right-align; negative N will left-align; padding is ignored if the output is wider than N. The default is to automatically pad if a whitespace is found
--round= METHOD use METHOD for rounding when scaling; METHOD is up, down, from-zero (default), towards-zero or nearest
--suffix= SUFFIX add SUFFIX to output numbers and accept optional SUFFIX in input numbers
--to= UNIT auto-scale output numbers to UNIT. UNIT is none, si, iec or iec-i
--to-unit= N the output unit size (instead of the default 1)
-z --zero-terminated line delimiter is NUL (not newline)
--help
--version

Examples

Specifying UNIT with --to

$ numfmt 1024 --to none
1024

$ numfmt 1024 --to si
1.1 K

$ numfmt 1024 --to iec
1.0 K

$ numfmt 1024 --to iec-i
1.0 Ki

Specifying UNIT with --from

$ numfmt  1K  --from auto
1000

$ numfmt  1K  --from si
1000

$ numfmt  1K  --from iec
1024

$ numfmt  1Ki --from iec-i
1024

Using fields

$ echo 'abc  12345  67890  def' | numfmt --to iec
numfmt: invalid number: ‘abc’

$ echo 'abc  12345  67890  def' | numfmt --to iec --field 2
abc    13K  67890  def

$ echo 'abc  12345  67890  def' | numfmt --to iec --field 2,3
abc    13K  67K  def

Specifying a format

$ numfmt 12345 --to iec
13K

$ numfmt 12345 --to iec --format %3.2f
12.06K

Report the size of the hibernation image:

$ cat /sys/power/image_size
26840137728
$ cat /sys/power/image_size | numfmt --to iec
25G

See also

ls prints files sizes in a human readable format with the option -h.
Shell commands

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