2.11BSD#431 - /usr/man/cat1/join.0

JOIN(1)             UNIX Programmer's Manual		  JOIN(1)


NAME
     join - relational database operator

SYNOPSIS
     join [ options ] file1 file2

DESCRIPTION
     Join forms, on the standard output, a join of the two rela-
     tions 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, nor-
     mally the first in each line.

     There is one line in the output for each pair of lines in
     file1 and file2 that have identical 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.


Printed 11/26/99	 April 29, 1985                         1


JOIN(1)             UNIX Programmer's Manual		  JOIN(1)


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


Printed 11/26/99	 April 29, 1985                         2