need to pass parameters to working and tested awk script Post: 302468470

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Top Forums Shell Programming and Scripting need to pass parameters to working and tested awk script Post 302468470 by agama on Tuesday 2nd of November 2010 09:18:08 PM

11-02-2010

Registered User

Assuming you have a modern awk (nawk on Sun) this should work. I've added some 'fluff' to illustrate how to capture the command line parameters and use them in your script (don't mean to imply that you don't know how, but thought it made for a more complete example).

Code:

#!/usr/bin/env ksh

pos=$1
infile="$2/$3"
outfile=$infile.new

if [[ ! -r $infile ]]
then
        echo "file is not readable: $infile"
        exit 1
fi

# pass the key position using -v
awk -v key_col="$pos" '
        {
                split($NF,a,"_"); 
                key=$(key_col);   # this should be the only internal change (not needed -- see 2nd example)
                site=a[3];
                keysite=key "_" site;
                if (b[keysite]<=a[4]a[5]) 
                {
                        b[keysite]=a[4]a[5];
                        c[keysite]=$0;
                }
        }
        END{
                for( i in b ) 
                        print c[i];
        }' <$infile >$outfile

CAUTION: I've not tested this.

Since you only use the variable key to construct keysite, you could eliminate the first assignment and just code this:

Code:

keysite=$(key_col) "_" site;

Hope this helps get you started.

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LEARN ABOUT CENTOS

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)

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