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Full Discussion: Using Getopt Option
Top Forums UNIX for Dummies Questions & Answers Using Getopt Option Post 302411417 by Corona688 on Thursday 8th of April 2010 12:19:34 PM
Old 04-08-2010
Quote:
Originally Posted by ladyAnne
Hi

I need to use getopt option and I have no idea what it is or how to use it.
The idea behind getopt is, instead of having the first argument always be the source, the second argument always the destination, the third a conversion type, the fourth a debug file, the fifth just a flag, etc, etc, etc, your script would take parameters like:
Code:
myscript -i source -o dest -c conv -d debug

...in any order, so this would have the same effect:
Code:
myscript -d debug -o dest -i source -c conv

There's a scripting builtin for this called getopts. Here's an example with two arguments to expand however you wish. The -i argument expects a string, the -f argument does not.

Code:
#!/bin/bash

INPUT="default"
FLAG=""

while getopts ':i:f' OPT
do
        case "${OPT}" in
        f)      FLAG=1
                ;;
        i)      INPUT="${OPTARG}"
                ;;
        ?)      echo "Unknown argument"
                exit 1
                ;;
        esac
done

echo "FLAG=${FLAG} INPUT=${INPUT}"

Note the string ":i:f". The very first : tells it to fill in OPTARG when its supposed to. The : following i tells it that i expects an argument. There's no : following f, meaning f expects no argument.

Code:
$ ./opt.sh -f -iasdf
FLAG=1 INPUT=asdf
$ ./opt.sh -f -i asdf
FLAG=1 INPUT=asdf
$ ./opt.sh -i asdf -f
FLAG=1 INPUT=asdf
$ ./opt.sh -iasdf -f
FLAG=1 INPUT=asdf
$ ./opt.sh -f
FLAG=1 INPUT=default
$ ./opt.sh -f -q
Unknown argument
$

This script can then process arguments in any order the same way. You're being asked to build a simple shell wrapper around your awk script to do the same thing I believe.
 

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LEARN ABOUT OPENSOLARIS

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).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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