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Plan 9 - man page for sort (plan9 section 1)

SORT(1) 			     General Commands Manual				  SORT(1)

NAME
       sort - sort and/or merge files

SYNOPSIS
       sort [ -cmuMbdfinrwtx ] [ +pos1 [ -pos2 ] ...  ] ...  [ -k pos1 [ ,pos2 ] ] ...	[ -o out-
       put ] [ -T dir ...  ] [ option ...  ] [ file ...  ]

DESCRIPTION
       Sort sorts lines of all the files together and writes the result on the	standard  output.
       If no input files are named, the standard input is sorted.

       The  default sort key is an entire line.  Default ordering is lexicographic by runes.  The
       ordering is affected globally by the following options, one or more of which may appear.

       -M     Compare as months.  The first three non-white space characters  of  the  field  are
	      folded to upper case and compared so that precedes etc.  Invalid fields compare low
	      to

       -b     Ignore leading white space (spaces and tabs) in field comparisons.

       -d     `Phone directory' order: only letters, accented letters, digits and white space are
	      significant in comparisons.

       -f     Fold  lower  case letters onto upper case.  Accented characters are folded to their
	      non-accented upper case form.

       -i     Ignore characters outside the ASCII range 040-0176 in non-numeric comparisons.

       -w     Like -i, but ignore only tabs and spaces.

       -n     An initial numeric string, consisting of optional white  space,  optional  plus  or
	      minus  sign,  and  zero  or  more  digits with optional decimal point, is sorted by
	      arithmetic value.

       -g     Numbers, like -n but with optional e-style exponents, are sorted by value.

       -r     Reverse the sense of comparisons.

       -tx    `Tab character' separating fields is x.

       The notation +pos1 -pos2 restricts a sort key to a field beginning at pos1 and ending just
       before  pos2.  Pos1 and pos2 each have the form m.n, optionally followed by one or more of
       the flags Mbdfginr, where m tells a number of fields to skip from  the  beginning  of  the
       line  and  n  tells a number of characters to skip further.  If any flags are present they
       override all the global ordering options for this key.  A missing .n means .0;  a  missing
       -pos2 means the end of the line.  Under the -tx option, fields are strings separated by x;
       otherwise fields are non-empty strings separated by white space.   White  space	before	a
       field  is  part	of  the field, except under option -b.	A b flag may be attached indepen-
       dently to pos1 and pos2.

       The notation -k pos1[,pos2] is how POSIX sort defines fields: pos1 and pos2 have the  same
       format but different meanings.  The value of m is origin 1 instead of origin 0 and a miss-
       ing .n in pos2 is the end of the field.

       When there are multiple sort keys, later keys are compared only	after  all  earlier  keys
       compare equal.  Lines that otherwise compare equal are ordered with all bytes significant.

       These option arguments are also understood:

       -c	  Check  that  the  single  input file is sorted according to the ordering rules;
		  give no output unless the file is out of sort.

       -m	  Merge; assume the input files are already sorted.

       -u	  Suppress all but one in each set of equal lines.  Ignored bytes and bytes  out-
		  side keys do not participate in this comparison.

       -o	  The  next argument is the name of an output file to use instead of the standard
		  output.  This file may be the same as one of the inputs.

       -Tdir	  Put temporary files in dir rather than in /tmp.

EXAMPLES
       Print in alphabetical order all the unique spellings
	      in a list of words where capitalized words differ from uncapitalized.

       Print the users file
	      sorted by user name (the second colon-separated field).

       Print the first instance of each month in an already sorted file.
	      Options -um with just one input file make the choice  of	a  unique  representative
	      from a set of equal lines predictable.

       grep -n '^' input | sort -t: +1f +0n | sed 's/[0-9]*://'
	      A  stable  sort:	input  lines  that  compare equal will come out in their original
	      order.

FILES
       /tmp/sort.<pid>.<ordinal>

SOURCE
       /sys/src/cmd/sort.c

SEE ALSO
       uniq(1), look(1)

DIAGNOSTICS
       Sort comments and exits with non-null status for various trouble conditions and for disor-
       der discovered under option -c.

BUGS
       An external null character can be confused with an internally generated end-of-field char-
       acter.  The result can make a sub-field not sort less than a longer field.

       Some of the options, e.g.  -i and -M, are hopelessly provincial.

											  SORT(1)


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