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 DEBIAN

shcomp

SHCOMP(1)						    User Environment Utilities							 SHCOMP(1)

NAME

       shcomp - compile a ksh93 shell script

SYNOPSIS

       shcomp [ options ] [infile] [outfile]]

ORIGIN OF THIS MAN PAGE

       This man page was written by Christophe Martin <Schplurtz@free.fr> for the Debian GNU/Linux system. It is based on "shcomp --man" output.

DESCRIPTION

       Unless  -D  is  specified,  shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 can read and execute
       with the same effect as the original script.

       Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly.

       If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages	that  need  to	be  translated	to
       locale specific versions for internationalization.

       If  outfile is omitted, then the results will be written to standard output.  If infile is also omitted, the shell script will be read from
       standard input.

OPTIONS

       -D, --dictionary
	      Generate a list of strings that need to be placed in a message catalog for internationalization.

       -n, --noexec
	      Displays warning messages for obsolete or non-conforming constructs.

       -v, --verbose
	      Displays input from infile onto standard error as it reads it.

       --man  Displays this man page on standard error and exits.

       --help Shows a short help message and exits.

EXIT STATUS

       0      Successful completion.

       >0     An error occurred.

DEBIAN WARNING

       On a Debian GNU/Linux system, more than one package may provide ksh. the output of shcomp can only be used by ksh93.  Any other ksh will be
       unable to run the compiled script.

EXAMPLE

       ( echo '#! /bin/ksh93' ; shcomp myscript ) > myscript.bin &&
       chmod 755 myscript.bin
       ./myscript.bin

SEE ALSO

       ksh(1)

IMPLEMENTATION

       version	       shcomp (AT&T Labs Research) 2012-02-29
       author	       David Korn <dgk@research.att.com>
       copyright       Copyright (c) 1982-2012 AT&T Intellectual Property
       license	       http://www.eclipse.org/org/documents/epl-v10.html

KSH93								  Fri Jun 3 2005							 SHCOMP(1)

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