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Top Forums UNIX for Dummies Questions & Answers Finding differences between 2 text files Post 302469330 by ctsgnb on Friday 5th of November 2010 01:42:56 PM
Old 11-05-2010
Quote:
Originally Posted by Scrutinizer
Try:
Code:
 awk 'NR==FNR{A[$1];next}!($1 in A)' f1 f2

@Scruti
I don't get that one, could you please explain the code ?
I mean : f1 and f2 ... how awk does know which one it should take and when ?
What is between the simple quote apply to f1 ? or f2 ? or both ?
Why NR==FNR ? to make sure an associative array is set up for all records ? of f2 ?
 

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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). Free Software Foundation Nov 3 1999 IGAWK(1)
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