NAME

       numfmt - Convert numbers from/to human-readable strings

SYNOPSIS

       numfmt [OPTION]... [NUMBER]...

DESCRIPTION

       Reformat NUMBER(s), or the numbers from standard input if none are specified.

       Mandatory arguments to long options are mandatory for short options too.

       --debug
              print warnings about invalid input

       -d, --delimiter=X
              use X instead of whitespace for field delimiter

       --field=FIELDS
              replace the numbers in these input fields (default=1); see FIELDS below

       --format=FORMAT
              use printf style floating-point FORMAT; see FORMAT below for details

       --from=UNIT
              auto-scale input numbers to UNITs; default is 'none'; see UNIT below

       --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 can be: abort (default), fail, warn, 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 can be: up, down, from-zero (default), towards-zero,
              nearest

       --suffix=SUFFIX
              add SUFFIX to output numbers, and accept optional SUFFIX in input numbers

       --to=UNIT
              auto-scale output numbers to UNITs; see UNIT below

       --to-unit=N
              the output unit size (instead of the default 1)

       -z, --zero-terminated
              line delimiter is NUL, not newline

       --help display this help and exit

       --version
              output version information and exit

   UNIT options:
       none   no auto-scaling is done; suffixes will trigger an error

       auto   accept optional single/two letter suffix:

              1K = 1000, 1k = 1000, 1Ki = 1024, 1M = 1000000, 1Mi = 1048576,

       si     accept optional single letter suffix:

              1k = 1000, 1K = 1000, 1M = 1000000, ...

       iec    accept optional single letter suffix:

              1K = 1024, 1k = 1024, 1M = 1048576, ...

       iec-i  accept optional two-letter suffix:

              1Ki = 1024, 1ki = 1024, 1Mi = 1048576, ...

   FIELDS supports cut(1) style field ranges:
       N      N'th field, counted from 1

       N-     from N'th field, to end of line

       N-M    from N'th to M'th field (inclusive)

       -M     from first to M'th field (inclusive)

       -      all fields

       Multiple fields/ranges can be separated with commas

       FORMAT must be suitable for printing one floating-point argument '%f'.  Optional quote (%'f) will  enable
       --grouping  (if supported by current locale).  Optional width value (%10f) will pad output. Optional zero
       (%010f) width will zero pad the number. Optional negative  values  (%-10f)  will  left  align.   Optional
       precision (%.1f) will override the input determined precision.

       Exit  status  is 0 if all input numbers were successfully converted.  By default, numfmt will stop at the
       first conversion error with exit  status  2.   With  --invalid='fail'  a  warning  is  printed  for  each
       conversion error and the exit status is 2.  With --invalid='warn' each conversion error is diagnosed, but
       the exit status is 0.  With --invalid='ignore' conversion errors are not diagnosed and the exit status is
       0.

EXAMPLES

              $ numfmt --to=si 1000

              -> "1.0k"

              $ numfmt --to=iec 2048

              -> "2.0K"

              $ numfmt --to=iec-i 4096

              -> "4.0Ki"

              $ echo 1K | numfmt --from=si

              -> "1000"

              $ echo 1K | numfmt --from=iec

              -> "1024"

              $ df -B1 | numfmt --header --field 2-4 --to=si
              $ ls -l  | numfmt --header --field 5 --to=iec
              $ ls -lh | numfmt --header --field 5 --from=iec --padding=10
              $ ls -lh | numfmt --header --field 5 --from=iec --format %10f

AUTHOR

       Written by Assaf Gordon.

REPORTING BUGS

       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT

       Copyright  ©  2024  Free  Software  Foundation,  Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later
       <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.

SEE ALSO

       Full documentation <https://www.gnu.org/software/coreutils/numfmt>
       or available locally via: info '(coreutils) numfmt invocation'

GNU coreutils 9.5                                  April 2025                                          NUMFMT(1)