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You can use GFlags.

It gives you the option to define: DEFINE_bool

Example:

DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");

From the command line you can define:

sh script.sh --bigmenu
sh script.sh --nobigmenu # False

You can use shFlags.

It gives you the option to define: DEFINE_bool

Example:

DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");

From the command line you can define:

sh script.sh --bigmenu
sh script.sh --nobigmenu # False

You can use GFlags.

It gives you the option to define: DEFINE_bool

Example:

DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");

From the command line you can define:

sh script.sh --bigmenu
sh script.sh --nobigmenu # False

You can use GFlags.

It gives you the option to define: DEFINE_bool

Example:

DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");

From the command line you can define:

sh script.sh --bigmenu
sh script.sh --nobigmenu # False

You can use GFlags: https://gflags.github.io/gflags/

It gives you the option to define: DEFINE_bool

Example:

DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");

From command line you can define:

sh script.sh --bigmenu
sh script.sh --nobigmenu # False

You can use GFlags.

It gives you the option to define: DEFINE_bool

Example:

DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");

From the command line you can define:

sh script.sh --bigmenu
sh script.sh --nobigmenu # False