1JOIN(1)                          User Commands                         JOIN(1)
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NAME

6       join - join lines of two files on a common field
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SYNOPSIS

9       join [OPTION]... FILE1 FILE2
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DESCRIPTION

12       For  each  pair of input lines with identical join fields, write a line
13       to standard output.  The default join field is the first, delimited  by
14       whitespace.  When FILE1 or FILE2 (not both) is -, read standard input.
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16       -a FILENUM
17              print  unpairable  lines coming from file FILENUM, where FILENUM
18              is 1 or 2, corresponding to FILE1 or FILE2
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20       -e EMPTY
21              replace missing input fields with EMPTY
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23       -i, --ignore-case
24              ignore differences in case when comparing fields
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26       -j FIELD
27              equivalent to `-1 FIELD -2 FIELD'
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29       -o FORMAT
30              obey FORMAT while constructing output line
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32       -t CHAR
33              use CHAR as input and output field separator
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35       -v FILENUM
36              like -a FILENUM, but suppress joined output lines
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38       -1 FIELD
39              join on this FIELD of file 1
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41       -2 FIELD
42              join on this FIELD of file 2
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44       --help display this help and exit
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46       --version
47              output version information and exit
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49       Unless -t CHAR  is  given,  leading  blanks  separate  fields  and  are
50       ignored,  else fields are separated by CHAR.  Any FIELD is a field num‐
51       ber counted from 1.  FORMAT is one or more  comma  or  blank  separated
52       specifications, each being `FILENUM.FIELD' or `0'.  Default FORMAT out‐
53       puts the join field, the remaining fields  from  FILE1,  the  remaining
54       fields from FILE2, all separated by CHAR.
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56       Important:  FILE1  and  FILE2 must be sorted on the join fields.  E.g.,
57       use `sort -k 1b,1' if `join' has no options.
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AUTHOR

60       Written by Mike Haertel.
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REPORTING BUGS

63       Report bugs to <bug-coreutils@gnu.org>.
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66       Copyright © 2007 Free Software Foundation, Inc.
67       This is free software.  You may redistribute copies  of  it  under  the
68       terms       of       the      GNU      General      Public      License
69       <http://www.gnu.org/licenses/gpl.html>.  There is NO WARRANTY,  to  the
70       extent permitted by law.
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SEE ALSO

73       The  full documentation for join is maintained as a Texinfo manual.  If
74       the info and join programs are properly installed  at  your  site,  the
75       command
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77              info join
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79       should give you access to the complete manual.
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83GNU coreutils 6.9                 March 2008                           JOIN(1)
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