NBash

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#!/usr/bin/env bash
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PATH="..:$PATH"
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# Load argsparse library.
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. argsparse.sh
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# You can also change the way options are set by defining a function
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# named set_option_<optionname>.
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argsparse_use_option option1 "An option." value type:hexa
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set_option_option1() {
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	local option=$1
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	local value=$2
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	# You can do own stuff here. Whatever you want, including,
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	# transforming the value, calling other functions, performing some
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	# actions..
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	# E.g: you could enforce the 0x in front of a user-given
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	# hexadecimal value.
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	if [[ "$value" != 0x* ]]
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	then
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		value="0x$value"
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	fi
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	# This is the original argsparse setting action.
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	argsparse_set_option_with_value "$option" "$value"
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}
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# For options without value.
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argsparse_use_option option2 "Another option."
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set_option_option2() {
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	local option=$1
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	# Again, you can do whatever you want here.
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	: some command with some params.
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	# You dont have to do it, but it makes sense to call in the end
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	# the original argsparse action.
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	argsparse_set_option_without_value "$option"
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}
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# This is a way to re-implement a cumulative option if you're
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# satisfied with the 'cumulative' property.
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argsparse_use_option cumul "A cumulative option." value
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all_cumul_values=()
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set_option_cumul() {
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	local option=$1
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	local value=$2
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	# Append the value to the array.
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	all_cumul_values+=( "$value" )
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	# Doing this will prevent the argsparse_is_option_set test from
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	# returning false.
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	argsparse_set_option_with_value "$option" 1
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}
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# 
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printf -v argsparse_usage_description "%s\n" \
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	"A tutorial script teaching how to change the way options are set." \
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	"Try command lines such as:" \
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	" $0" \
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	" $0 -h" \
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	" $0 --option1 123a" \
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	" $0 --option2" \
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	" $0 --cumul first --cumul second --cumul other"
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# Command line parsing is done here.
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argsparse_parse_options "$@"
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printf "Options reporting:\n"
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# Simple reporting function.
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argsparse_report
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printf "End of argsparse report.\n\n"
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printf "These are all the 'cumul' option values:\n"
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i=0
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for v in ${all_cumul_values[@]}
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do
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	printf "Value #%d: %s\n" $((++i)) "$v"
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done
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