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Unix Version 7 - man page for sort (v7 section 1)

SORT(1) 			     General Commands Manual				  SORT(1)

       sort - sort or merge files

       sort [ -_________x ] [ +pos1  [ -pos2 ] ] ...  [ -o name ] [ -T directory ] [ name ] ...

       Sort  sorts  lines  of  all the named files together and writes the result on the standard
       output.	The name `-' means the standard input.	If no input files are named, the standard
       input is sorted.

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

       b    Ignore leading blanks (spaces and tabs) in field comparisons.

       d    `Dictionary' order: only letters, digits and blanks are significant in comparisons.

       f    Fold upper case letters onto lower case.

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

       n    An	initial  numeric  string, consisting of optional blanks, optional minus sign, and
	    zero or more digits with optional decimal  point,  is  sorted  by  arithmetic  value.
	    Option n implies option b.

       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 bdfinr, 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  over-
       ride  all  the  global  ordering  options for this key.	If the b option is in effect n is
       counted from the first nonblank in the field; b is  attached  independently  to	pos2.	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 nonempty  nonblank  strings  sepa-
       rated by blanks.

       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 input file is sorted according to the ordering rules; give  no  output
	    unless the file is out of sort.

       m    Merge only, the input files are already sorted.

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

       T    The next argument is the name of a directory in which temporary files should be made.

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

       Examples.  Print in alphabetical order all the unique spellings in a list of words.  Capi-
       talized words differ from uncapitalized.

	       sort -u +0f +0 list

       Print the password file (passwd(5)) sorted by user  id  number  (the  3rd  colon-separated

	       sort -t: +2n /etc/passwd

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

	       sort -um +0 -1 dates

       /usr/tmp/stm*, /tmp/*: first and second tries for temporary files

       uniq(1), comm(1), rev(1), join(1)

       Comments  and  exits  with  nonzero status for various trouble conditions and for disorder
       discovered under option -c.

       Very long lines are silently truncated.


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