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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# Declaring an option not accepting a value and not having a
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# single-char equivalent.
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argsparse_use_option option1 "An option."
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# Declaring an option not accepting a value but with a single-char
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# equivalent.
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# "short" is a property, and "o" is the value of the "short" property
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# for this option. Argsparse can handle other properties, see other
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# tutorials.
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argsparse_use_option option2 "Another option." short:o
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# Alternative syntax to declare an option with a single-char
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# equivalent. A '=' char can be put prior to a char in the option name
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# to make a single-letter equivalent. e.g:
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argsparse_use_option o=ption3 "A 3rd option."
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# does the same as:
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# argsparse_use_option option3 "A 3rd option." short:p
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# You can declare an option without property...
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argsparse_use_option option4 "A 4th option."
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# ... and set a property after the declaration using the
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# argsparse_set_option_property function.
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argsparse_set_option_property short:4 option4 
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# argsparse_usage_description is a simple variable printed at the end
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# of the usage function invocation.
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printf -v argsparse_usage_description "%s\n" \
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	"A tutorial script for argsparse basics." \
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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" \
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	" $0 --option1 -h" \
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	" $0 --option2" \
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	" $0 -o -p -4" \
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	" $0 -op4" \
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	" $0 --doesnt-exist" \
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	" $0 --option1 -o -o -o one two 5"
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# Command line parsing is done here.
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argsparse_parse_options "$@"
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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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for option in option{1..4}
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do
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	# This is the way you should test your options....
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	if argsparse_is_option_set "$option"
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	then
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		printf "%s was set %d time(s) on the command line.\n" \
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			"$option" \
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			"${program_options[$option]}" # ... and this is the way
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										  # you should access them.
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	else
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		printf "%s was not on the command line.\n" "$option"
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	fi
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done
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printf "\n"
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i=1
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# You can access all other script parameters through the
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# program_params array.
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for param in "${program_params[@]}"
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do
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	printf "Parameter #%d: %s\n" $((i++)) "$param"
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done
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