code: purgatorio

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update arg(2) to show earg(), setusage(), and usage() examples

--- a/man/2/arg

+++ b/man/2/arg

@@ -120,12 +120,15 @@

     bflag := cflag := 0;

     file := "";

     arg->init(args);

+    arg->setusage("prog [-bc] [-f file] args ...");

     while((c := arg->opt()) != 0)

         case c {

         'b' => bflag = 1;

         'c' => cflag = 1;

-        'f' => file = arg->arg();

-        * =>   sys->print("unknown option (%c)\en", c);

+        'f' => file = arg->earg();

+        * =>

+            sys->print("unknown option (%c)\en", c);

+            arg->usage();

         }

     args = arg->argv();

     sys->print("%s %d %d %s\en", arg->progname(), bflag, cflag, file);