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Top Forums Shell Programming and Scripting Conditional grep command to search entire file Post 302697447 by Corona688 on Thursday 6th of September 2012 08:52:32 PM
Old 09-06-2012
grep is not conditional. It matches lines. It's not a language...

awk is a language, and can do things conditionally. You can even tell it to read the same file twice... On the first pass, save the ID's. On the second pass, fill in missing ones...

Code:
awk 'NR==FNR && !($5 ~ /none/) {
        A[$12]=$5 # Save ID and key for later
        next # Skip to next line
}

($5 ~ /none/) && ($12 in A) { $5=A[$12] } 1' logfile logfile > output

 

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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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