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BSD 2.11 - man page for join (bsd section 1)

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JOIN(1) 										  JOIN(1)

NAME
       join - relational database operator

SYNOPSIS
       join [ options ] file1 file2

DESCRIPTION
       Join  forms, on the standard output, a join of the two relations specified by the lines of
       file1 and file2.  If file1 is `-', the standard input is used.

       File1 and file2 must be sorted in increasing ASCII collating sequence  on  the  fields  on
       which they are to be joined, normally the first in each line.

       There  is one line in the output for each pair of lines in file1 and file2 that have iden-
       tical join fields.  The output line normally consists of the common field, then	the  rest
       of the line from file1, then the rest of the line from file2.

       Fields are normally separated by blank, tab or newline.	In this case, multiple separators
       count as one, and leading separators are discarded.

       These options are recognized:

       -an    In addition to the normal output, produce a line for each unpairable line  in  file
	      n, where n is 1 or 2.

       -e s   Replace empty output fields by string s.

       -jn m  Join on the mth field of file n.	If n is missing, use the mth field in each file.

       -o list
	      Each  output line comprises the fields specified in list, each element of which has
	      the form n.m, where n is a file number and m is a field number.

       -tc    Use character c as a separator (tab character).  Every appearance of c in a line is
	      significant.

SEE ALSO
       sort(1), comm(1), awk(1)

BUGS
       With  default  field  separation,  the collating sequence is that of sort -b; with -t, the
       sequence is that of a plain sort.

       The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous.

7th Edition				  April 29, 1985				  JOIN(1)
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