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Top Forums UNIX for Dummies Questions & Answers merge files along with file names (awk)? Post 302570926 by Corona688 on Friday 4th of November 2011 04:49:01 PM
Old 11-04-2011
If you have a few thousand files, there's an even faster way:

Code:
<fileID awk '{ printf("file.%s.extension\n", $1); }' | xargs awk '{if($5 < 0.01) print FILENAME, $0 }' >> betaout

Once you're processing more than a few lines, it's faster to use awk than a shell language, so we let awk translate the names for us, feeding them into xargs, which will run 'awk '{...}' file1 file2 file3 file4 file5 ...' for as many files as it can safely cram in one commandline, over and over, until it's used up all the filenames. Thus can reduce the number of times awk needs to be run manyfold, making it more efficient.
 

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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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