Listing 2. Options Function
options()
{
# return values
typeset OPTIONS_WRONG_ARGS=1
# Initialisation
typeset opts argname num
options_unknown_option=
options_missing_arg=
options_shift_val=0
options_num_args_left=0
# ensure we have at least 2 arguments (getopts
# spec and at least one other)
[ $# -gt 1 ] || return $OPTIONS_NO_ARGS
opts=":$1" # get the getopts option
# argument and add a leading
shift # colon to stop getopts
# printing error messages
OPTERR=0
OPTIND=1
while getopts $opts argname
do
if [ "$argname" = "?" ]
then # code handles bash getopts bug
if echo $opts | grep $OPTARG >/dev/null 2>&1
then # option is really known so it must
options_missing_arg=$OPTARG # have a
# missing arg
else
options_unknown_option=$OPTARG
fi
continue
fi
if [ "$argname" = ":" ]
then
options_missing_arg=$OPTARG
continue
fi
if [ "$OPTARG" != "" ]
then
eval opt_$argname=$OPTARG # set option name
# to value
else
eval opt_$argname=1 # set option name to 1
fi
done
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