SYNOPSIS

       join [options] [file1] [file2]

DESCRIPTION

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

       File1 and file2 must be sorted in increasing current 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  con-
       sists  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; or 0, which specifies the join field.   The
              list  may  either  consist of multiple arguments, or of a single
              argument with elements separated by spaces or commas.

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

       The following options have been introduced by POSIX.2:

       -vn    Suppress  normal  output  and produce a line for each unpairable
              line in file n, where n is 1 or 2.

       -1 m   Join on the mth field of file 1.

       -2 m   Join on the mth field of file 2.

ENVIRONMENT VARIABLES

       LANG, LC_ALL
              See locale(7).

       The  conventions of join, sort, comm, uniq and awk(1) are wildly incon-
       gruous.



Heirloom Toolchest                  2/5/05                             JOIN(1)