#!/bin/bash

announce () {
	[[ $verbose -eq 1 ]] && echo "$@"
	[[ ! -z $logfile ]] && echo "$@" >> "$logfile"
}


usage()
{
	cat <<EOF
Usage: $0 [-v] [-l file]
  -v   - verbose
  -l   - logfile
EOF
}


main()
{
	while getopts "l:v" c; do
		case "$c" in
			v) verbose=1;;
			l) logfile="$OPTARG";;
			?*) usage && exit 1;;
		esac
	done

	announce "Running:"
	# ...
}
main "$@"