


      JOIN(1)                     (UNIX 5.0)                    JOIN(1)



      NAME
           join - relational database operator

      SYNTAX
           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 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 new-line.  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 specifed 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
           awk(1), comm(1), sort(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 and awk(1)
           are inconsistent.




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