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Full Discussion: ksh parsing arguments in a string rather than from the cmdln
Top Forums Shell Programming and Scripting ksh parsing arguments in a string rather than from the cmdln Post 303007363 by Don Cragun on Wednesday 15th of November 2017 04:06:03 PM
Old 11-15-2017
Quote:
Originally Posted by pnolanch
Hi. I have a piece of code that reads and parses command line options. I'd like to alter it slightly to read from a string (that's set elsewhere in the script) rather than directly from the command line (arg). Can somebody show me how to do this? Many thanks.

My code is as follows:

Code:
typeset flags_args=''
for arg; do
    case $arg in
        -version )  flags_args="${flags_args} -t" ;;
        -host ) flags_args="${flags_args} -r" ;;
        -debug ) flags_args="${flags_args} -d" ;;
        * )       flags_args="${flags_args} $arg" ;;
    esac
done
set -- ${flags_args}

while getopts :t:r:d args; do
    case $args in
        t) typeset VERSION="$OPTARG" ;;
        r) typeset HOST="$OPTARG" ;;
        d) typeset DEBUG="true"; typeset DEBUG="DEBUG" ;;
        *) print "Invalid option specified." ;;
    esac
done
shift $((OPTIND-1));

Instead of reading the arguments from command line I'd like the code to read from the following variable that's set inside the KSH script:
Code:
STR="-version 99 -host testhost "

or
Code:
STR="-version 99 -host testhost -debug"

Many versions of the Korn shell include a getopts that supports both long options and short options (although support for long options isn't always mentioned in the ksh man page). If you could introduce your long options with -- instead of a single -, you might want to try the following replacement for your code:
Code:
while getopts ':t:(version)r:(host)d(debug)' args; do
    case $args in
        t) typeset VERSION="$OPTARG" ;;
        r) typeset HOST="$OPTARG" ;;
        d) typeset DEBUG="DEBUG" ;;
        *) print "Invalid option specified." ;;
    esac
done
shift $((OPTIND-1));
printf 'DEBUG has been set to "%s"\n' "$DEBUG"
printf 'HOST has been set to "%s"\n' "$HOST"
printf 'VERSION has been set to "%s"\n' "$VERSION"

and see what happens when you invoke it with:
Code:
script_name --version 99 --host=testhost

and:
Code:
script_name -t 98.6 -rmyhost --debug

When I try the above two commands with ksh on macOS High Sierra (version 10.13.1), I get the output:
Code:
DEBUG has been set to ""
HOST has been set to "testhost"
VERSION has been set to "99"

and:
Code:
DEBUG has been set to "DEBUG"
HOST has been set to "myhost"
VERSION has been set to "98.6"

 

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