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STRING-UNDEF(1)             General Commands Manual            STRING-UNDEF(1)

NNAAMMEE
       string-undef - expanding undefined strings

DDEESSCCRRIIPPTTIIOONN
   UUsseerr ddeeffiinneedd ssttrriinngg
       The sting "mys" is undefined and remains undefined.

       Its value is "", and now it is defined, and its value is still "".

       After redefining it to "newval", it is of course still defined.

       After removing the definition, it is now undefined.

   UUsseerr ddeeffiinneedd mmaaccrroo
       The macro "mym" is undefined.

       It has no effect: But now it is defined.

       After defining it as: neweffect it is of course still defined.

       After removing the definition, it is now undefined.

   RReennaammeedd mmaaccrroo
       The standard .BR macro is defined, and it wwoorrkkss.

       After renaming it, the new name is defined, and wwoorrkkss.

   PPrreeddeeffiinneedd ssttrriinngg
       A predefined string is defined and has the value "(R)".

OpenBSD                          April 9, 2018                 STRING-UNDEF(1)