awk multiline matching Post: 302551507

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Top Forums Shell Programming and Scripting awk multiline matching Post 302551507 by shamrock on Tuesday 30th of August 2011 04:27:06 PM

08-30-2011

Registered User

Quote:

Originally Posted by jtollefson

Shamrock,
I was wondering if you would be able to break that awk command apart with comments if you wouldn't mind? I'm trying to understand what the purpose of {f=1} & {f=0} are.

This looks like something I may be able to use at some point but I apologize, I don't understand what parts of it are doing Smilie

awk scripts are made up of pattern/action pairs which are executed on every line that awk reads.

/pairwiseDifferenceMatrix/ tells awk that whenever it sees that pattern on a line the action should be to enable a flag variable f...set f to 1...so this is kind of like saying START.

/^<\/pairwiseDifferenceMatrix/ tells awk that whenever it sees that pattern on a line the action should be to disable the flag variable f...set it to zero...so this is kind of like saying STOP.

f && NF==3 tells awk that if "f" is non-zero and NF (number of fields) equals 3...it should print the 2nd field of the current line...followed by getting the next line and printing its third field.

Code:

awk '
   /pairwiseDifferenceMatrix/     {f=1}
   /^<\/pairwiseDifferenceMatrix/ {f=0}
   f && NF==3 {printf("%s ",$2);getline;print $3}
' file

Last edited by shamrock; 08-30-2011 at 05:34 PM..

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igawk

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)