[root@worm ~]# cat MainProgram.sh
#!/bin/sh
Execute ()
{
        echo -e "Executing $@ ...";
        $@;
}
Execute "./getopts.sh -P 'hello world'"
./getopts.sh -P 'hello world'


[root@worm ~]# cat getopts.sh
#!/bin/sh
while getopts "P:" i
do
    case "$i" in
        P)
                VAR="$OPTARG";
                continue;;
        *)
                echo $usage;
                exit 1;;
    esac
done
echo $VAR


[root@worm ~]# ./MainProgram.sh
Executing ./getopts.sh -P 'hello world' ...
'hello
hello world