Synopsis:
   set pad_char [<character>]

Description:
   If this variable is set, the character it is set to will be used to pad
   right-aligned text, instead of using spaces.  It can be set to a space,
   or unset, to return to the default behavior.

See Also:
   Expressions(7)

Other Notes:
   This variable can actually be set to a string of any length.  However,
   only the first character is actually significant in this context.