/usr/bin/sort

Usage: /usr/bin/sort [OPTION]... [FILE]...
  or:  /usr/bin/sort [OPTION]... --files0-from=F
Write sorted concatenation of all FILE(s) to standard output.

With no FILE, or when FILE is -, read standard input.

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

  -b, --ignore-leading-blanks
         ignore leading blanks when finding sort keys in each line
  -d, --dictionary-order
         consider only blanks and alphanumeric characters
  -f, --ignore-case
         fold lower case to upper case characters
  -g, --general-numeric-sort
         compare according to general numerical value
  -i, --ignore-nonprinting
         consider only printable characters
  -M, --month-sort
         compare (unknown) < 'JAN' < ... < 'DEC'
  -h, --human-numeric-sort
         compare human readable numbers (e.g., 2K 1G)
  -n, --numeric-sort
         compare according to string numerical value;
         see full documentation for supported strings
  -R, --random-sort
         shuffle, but group identical keys.  See also shuf(1)
      --random-source=FILE
         get random bytes from FILE
  -r, --reverse
         reverse the result of comparisons
      --sort=WORD
         sort according to WORD:
           general-numeric -g, human-numeric -h, month -M,
           numeric -n, random -R, version -V
  -V, --version-sort
         natural sort of (version) numbers within text

Other options:

      --batch-size=NMERGE
         merge at most NMERGE inputs at once; for more use temp files
  -c, --check, --check=diagnose-first
         check for sorted input; do not sort
  -C, --check=quiet, --check=silent
         like -c, but do not report first bad line
      --compress-program=PROG
         compress temporaries with PROG; decompress them with PROG -d
      --debug
         annotate the part of the line used to sort,
         and warn about questionable usage to standard error
      --files0-from=F
         read input from the files specified by NUL-terminated names in file F;
         If F is -, read names from standard input
  -k, --key=KEYDEF
         sort via a key; KEYDEF gives location and type
  -m, --merge
         merge already sorted files; do not sort
  -o, --output=FILE
         write result to FILE instead of standard output
  -s, --stable
         stabilize sort by disabling last-resort comparison
  -S, --buffer-size=SIZE
         use SIZE for main memory buffer
  -t, --field-separator=SEP
         use SEP instead of non-blank to blank transition
  -T, --temporary-directory=DIR
         use DIR for temporaries, not $TMPDIR or /tmp;
         multiple options specify multiple directories
      --parallel=N
         change the number of sorts run concurrently to N
  -u, --unique
         output only the first of lines with equal keys;
         with -c, check for strict ordering
  -z, --zero-terminated
         line delimiter is NUL, not newline
      --help
         display this help and exit
      --version
         output version information and exit

KEYDEF is F[.C][OPTS][,F[.C][OPTS]] for start and stop position, where F is a
field number and C a character position in the field; both are origin 1, and
the stop position defaults to the line's end.  If neither -t nor -b is in
effect, characters in a field are counted from the beginning of the preceding
whitespace.  OPTS is one or more single-letter ordering options [bdfgiMhnRrV],
which override global ordering options for that key.  If no key is given, use
the entire line as the key.  Use --debug to diagnose incorrect key usage.

SIZE may be followed by the following multiplicative suffixes:
% 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y, R, Q.

*** WARNING ***
The locale specified by the environment affects sort order.
Set LC_ALL=C to get the traditional sort order that uses
native byte values.

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/sort>
or available locally via: info '(coreutils) sort invocation'