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NAMEjoin - join lines of two files on a common fieldSYNOPSISjoin [OPTION]... FILE1 FILE2DESCRIPTIONFor each pair of input lines with identical join fields, write a line to standard output. The default join field is the first, delimited by whitespace. When FILE1 or FILE2 (not both) is -, read standard input.
Unless -t CHAR is given, leading blanks separate fields and are ignored, else fields are separated by CHAR. Any FIELD is a field number counted from 1. FORMAT is one or more comma or blank separated specifications, each being 'FILENUM.FIELD' or '0'. Default FORMAT outputs the join field, the remaining fields from FILE1, the remaining fields from FILE2, all separated by CHAR. If FORMAT is the keyword 'auto', then the first line of each file determines the number of fields output for each line. Important: FILE1 and FILE2 must be sorted on the join fields. E.g., use "sort -k 1b,1" if 'join' has no options, or use "join -t ''" if 'sort' has no options. Note, comparisons honor the rules specified by 'LC_COLLATE'. If the input is not sorted and some lines cannot be joined, a warning message will be given. GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report join translation bugs to <http://translationproject.org/team/> AUTHORWritten by Mike Haertel.COPYRIGHTCopyright © 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSOcomm(1), uniq(1)The full documentation for join is maintained as a Texinfo manual. If the info and join programs are properly installed at your site, the command
should give you access to the complete manual.
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