#!/bin/bash

parseArguments() {
    if [[ $# -lt 3 ]]; then
        echo "Usage: $0 host user pass"
        exit 1
    fi
host="$1"
user="$2"
pass="$3"

# do you stuff here, and put the following at the main part of the script : 
parseArguments() $@

f=0
while [ $# -gt 0 ]; do
        case "$1" in
        -o?*)
                # handles things like -oValue
                o=`expr "$1" : '..\(.*\)'`
        ;;
        -o)
                # handles things like -o Value
                o="$2"
                shift
        ;;
        -f)
                # Just a flag (on/off)
                f=1
        ;;
        *)
                break
        ;;
        esac
        shift
done
echo "o=$o, f=$f"
# Loop through remaining arguments (arguments without a hyphen)
for arg in "$@"; do
        echo "$arg"
done