JOIN(1)                 COMMAND REFERENCE                 JOIN(1)



NAME
     join - relational database operator

SYNOPSIS
     join [ -an ] [ -e s ] [ -jn m ] [ -o list ] [ -tc ] 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,
     but the output format may be specified in any order by using
     the -o option.

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

OPTIONS
     -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.  This must be
        used with the -o option so that the correct number of
        fields is known.  Otherwise, the -e option is ignored.

     -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.  The elements of the list
        must be separate command line arguments.

     -tc
        Use character c as a separator (tab character).  Every
        appearance of c in a line is significant.  The default
        separator whitespace (tabs and spaces).  Only one
        separator character can be specified.



Printed 4/6/89                                                  1

JOIN(1)                 COMMAND REFERENCE                 JOIN(1)



EXAMPLES
     In the following example, the contents of the file numbers
     is:

          Bill 482-3659
          Jane 441-3666
          Sue  819-2134

     and the contents of the file work_area is:

          Materials Bill
          Documents Jane
          Management Sue

     The command:

          join -j1 2 work_area numbers

     produces the output:

          Bill Materials 482-3659
          Jane Documents 441-3666
          Sue Management 819-2134

     and the command:

          join -j2 2 numbers work_area

     produces the output:

          Bill 482-3659 Materials
          Jane 441-3666 Documents
          Sue 819-2134 Management

RETURN VALUE
     [NO_ERRS]      Command completed without error.

     [USAGE]        Incorrect command line syntax. Execution
                    terminated.

     [P_ERR]        A system error occurred. Execution
                    terminated.  See intro(2) for more
                    information on system errors.

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

     An input file to join may have initial blank lines, but
     shouldn't contain any other blank lines.




Printed 4/6/89                                                  2

JOIN(1)                 COMMAND REFERENCE                 JOIN(1)



SEE ALSO
     awk(1), comm(1), cut(1), egrep(1), fgrep(1), grep(1),
     look(1), paste(1), sort(1), and uniq(1).




















































Printed 4/6/89                                                  3

%%index%%
na:240,87;
sy:327,342;
de:669,1111;
op:1780,1209;
ex:3301,773;
rv:4074,444;
ca:4518,393;
se:5223,335;
%%index%%000000000135