====== Scripting Options ======

''err_exit''
  * if set, execute ZERR trap and exit if a command returns non-zero

''local_options''
  * shell options are to be restored after returning from a shell function

''multios''
  * enable multiple redirections

<code>
uptime > uptime0.txt > uptime1.txt
</code>

''c_bases''
  * output hex-numbers in '0x1F' format (see 'octal_zeroes')

''octal_zeroes''
  * print octal values the '0741' way

''warn_create_global''
  * print a warning when creating a global parameter by an assignment in a function