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Top Forums Shell Programming and Scripting awk or grep to search one column and output the other Post 302834821 by Scott on Saturday 20th of July 2013 04:38:00 AM
Old 07-20-2013
$ signifies a command prompt, it's not part of the code.

You don't need cat ... | while.

Just
Code:
awk 'NR==FNR{A[$0]=1; next} A[$1] {print $2}' fileA fileB > fileC

A is just a variable, call it what you want:
Code:
awk 'NR==FNR{row[$0]=1; next} row[$1] {print $2}' fileA fileB > fileC

=1 is just to record that the value of the record ($0) from the first file (FR==FNR) has been stored. This is used later (A[$1]) to test against the first field of the second file, in which case $2 from that file is displayed.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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