sort(1) - sort lines of text files
-b, --ignore-leading-blanks
       ignore leading blanks
-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
-R, --random-sort
       sort by random hash of keys
       get random bytes from FILE
-r, --reverse
       reverse the result of comparisons
       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:
       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 temporaries with PROG; decompress them with PROG -d
       annotate the part of the line used to sort, and warn about questionable usage to stderr
       read input from the files specified by NUL-terminated names in file F; If F is - then  read  names
       from standard input
-k, --key=POS1[,POS2]
       start a key at POS1 (origin 1), end it at POS2 (default end of line).  See POS syntax below
-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
       change the number of sorts run concurrently to N
-u, --unique
       with -c, check for strict ordering; without -c, output only the first of an equal run
-z, --zero-terminated
       end lines with 0 byte, not newline
--help display this help and exit
       output version information and exit

POS  is  F[.C][OPTS],  where  F  is  the field number and C the character position in the field; both are
origin 1.  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, which override global ordering
options for that key.  If no key is given, use the entire line as the key.

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.

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