Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk

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LEARN ABOUT PLAN9

join

JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME

       join - relational database operator

SYNOPSIS

       join [ options ] file1 file2

DESCRIPTION

       Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2.  If one of the file names 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.

       Input fields are normally separated spaces or tabs; output fields by space.  In this case, multiple separators count as	one,  and  leading
       separators are discarded.

       The following options are recognized, with POSIX syntax.

       -a n   In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.

       -v n   Like -a, omitting output for paired lines.

       -e s   Replace empty output fields by string s.

       -1 m
       -2 m   Join on the mth field of file1 or file2.

       -jn m  Archaic equivalent for -n m.

       -ofields
	      Each  output  line  comprises the designated fields.  The comma-separated field designators are either 0, meaning the join field, or
	      have the form n.m, where n is a file number and m is a field number.  Archaic usage allows separate arguments for field designators.

       -tc    Use character c as the only separator (tab character) on input and output.  Every appearance of c in a line is significant.

EXAMPLES

       sort /adm/users | join -t: -a 1 -e "" - bdays
	      Add birthdays to password information, leaving unknown birthdays empty.  The layout of is given in users(6); bdays  contains  sorted
	      lines like

       tr : ' ' </adm/users | sort -k 3 3 >temp
       join -1 3 -2 3 -o 1.1,2.1 temp temp | awk '$1 < $2'
	      Print all pairs of users with identical userids.

SOURCE

       /sys/src/cmd/join.c

SEE ALSO

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

BUGS

       With default field separation, the collating sequence is that of sort -b -ky,y; with -t, the sequence is that of sort -tx -ky,y.
       One of the files must be randomly accessible.

																	   JOIN(1)

Shell Programming and Scripting