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JOIN(1)								       JOIN(1)

       join - relational database operator

       join [ options ]	file1 file2

       Join  forms, on the standard output, a join of the two relations	speci-
       fied 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  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  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  appear-
	      ance of c	in a line is significant.

       sort(1),	comm(1), awk(1)

       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



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