getconf - Query system configuration variables

getconf -a

getconf [-v specification] system_var

getconf [-v specification] path_var pathname

-a

        Displays all configuration variables for the current system
        and their values.

-v

        Indicate the specification and version for which to obtain
        configuration variables.

system_var

        A system configuration variable, as defined by sysconf(3) or
        confstr(3).

path_var

        A system configuration variable as defined by pathconf(3). This
        must be used with a pathname.

sysconf(3), pathconf(3), confstr(3)