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Full Discussion: Getopts with optional parameters
Top Forums Shell Programming and Scripting Getopts with optional parameters Post 303017777 by gnnsprapa on Tuesday 22nd of May 2018 06:54:42 AM
Old 05-22-2018
Quote:
Originally Posted by ctac_
You can try this way
Code:
# Get parameters from command line
while getopts "b:r:w:f" opt; do
    case "$opt" in
    b)
        BankName=${OPTARG}
        ;;&
    r)
        Region=${OPTARG}
        ;;&
    w)
        WindowDate=${OPTARG}
        ;;&
    f)
        FilePattern="$2"
        ;;&
    b|r|w|f)
        shift 2
        OPTIND=1
        ;;
    *)
        show_help
        exit 0
        ;;
    esac
done

thanks for the suggestion @ctac_
i tried that but it was not giving me desired result as if i give 4 parameters the last parameter i.e. "-f" was taking first parameter's argument so i made some changes and now its working for both cases: here is my final code

Code:
function show_help {
    echo "Usage: ${0} -b [bankname] -r [region] -w [windowdate]"
    echo ""
    echo "    -b: BankName"
    echo "    -r: Region"
    echo "    -w: Windowdate"
    exit 0
}
# A POSIX variable

OPTIND=1 # Reset in case getopts has been used previously in the shell.
# set -x

# Default values
TRG=".TRG"


# Get parameters from command line
while getopts "b:r:w:f" opt; do
    case "$opt" in
    b)
        BankName=${OPTARG}
echo ${OPTIND}
        ;;
    r)
        Region=${OPTARG}
echo ${OPTIND}
        ;;
    w)
        WindowDate=${OPTARG}
echo ${OPTIND}
	;;
    f)
	FilePattern=$8  #$2 was giving me RBC so ichanged to $8
echo ${OPTIND}
	;;
    b|r|w|f)
        shift 2
        OPTIND=1
        ;;
    *)
        show_help
        exit 0
        ;;
    esac
done

shift $((OPTIND-1))
[ "$1" = "--" ] && shift

# If required variables aren't setup, show help and exit
unset MISSING_PARAM
if [[ -z ${BankName} ]]; then
    MISSING_PARAM="${MISSING_PARAM} b"
fi
if [[ -z ${Region} ]]; then
    MISSING_PARAM="${MISSING_PARAM} r"
fi
if [[ -z ${WindowDate} ]]; then
    MISSING_PARAM="${MISSING_PARAM} w"
fi

#removed -f missing_param check to ignore it when no argument provided to case -f
if [[ -n ${MISSING_PARAM} ]]; then
    echo "Error: Missing required parameter(s)"
    for PARAM in ${MISSING_PARAM}; do
        echo "    -${PARAM}"
    done
    echo ""
    show_help
    exit 0
fi

so thanks for you reply i got the idea how OPTIND works..let me know if we can tweak it more?
 

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LEARN ABOUT DEBIAN

latexml::parameters

LaTeXML::Parameters(3pm)				User Contributed Perl Documentation				  LaTeXML::Parameters(3pm)

NAME

       "LaTeXML::Parameters" - formal parameters, including "LaTeXML::Parameter".

DESCRIPTION

       Provides a representation for the formal parameters of LaTeXML::Definitions:

       "LaTeXML::Parameter"
	   represents an individual parameter.

   Parameters Methods
       "$parameters = parseParameters($prototype,$for);"
	   Parses a string for a sequence of parameter specifications.	Each specification should be of the form

	    {}	   reads a regular TeX argument, a sequence of
		   tokens delimited by braces, or a single token.
	    {spec} reads a regular TeX argument, then reparses it
		   to match the given spec. The spec is parsed
		   recursively, but usually should correspond to
		   a single argument.
	    [spec] reads an LaTeX-style optional argument. If the
		   spec is of the form Default:stuff, then stuff
		   would be the default value.
	    Type   Reads an argument of the given type, where either
		   Type has been declared, or there exists a ReadType
		   function accessible from LaTeXML::Package::Pool.
	    Type:value, or Type:value1:value2...    These forms
		   pass additional Tokens to the reader function.
	    OptionalType  Similar to Type, but it is not considered
		   an error if the reader returns undef.
	    SkipType  Similar to OptionalType, but the value returned
		   from the reader is ignored, and does not occupy a
		   position in the arguments list.

       "@parameters = $parameters->getParameters;"
	   Return the list of "LaTeXML::Parameter" contained in $parameters.

       "@tokens = $parameters->revertArguments(@args);"
	   Return a list of LaTeXML::Token that would represent the arguments such that they can be parsed by the Gullet.

       "@args = $parameters->readArguments($gullet,$fordefn);"
	   Read the arguments according to this $parameters from the $gullet.  This takes into account any special forms of arguments, such as
	   optional, delimited, etc.

       "@args = $parameters->readArgumentsAndDigest($stomach,$fordefn);"
	   Reads and digests the arguments according to this $parameters, in sequence.	this method is used by Constructors.

AUTHOR

       Bruce Miller <bruce.miller@nist.gov>

COPYRIGHT

       Public domain software, produced as part of work done by the United States Government & not subject to copyright in the US.

perl v5.10.1							    2009-06-11						  LaTeXML::Parameters(3pm)
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