Use the length operator (#) instead of table.getn.

table.getn was deprecated in Lua 5.1 in favor of #, the length operator.
See: http://www.lua.org/manual/5.1/manual.html#7.2

etc/check-links.lua

@@ -11,7 +11,7 @@ dispatch.TIMEOUT = 10
 
 -- make sure the user knows how to invoke us
 arg = arg or {}
-if table.getn(arg) < 1 then
+if #arg < 1 then
     print("Usage:\n  luasocket check-links.lua [-n] {<url>}")
     exit()
 end

etc/dispatch.lua

@@ -76,7 +76,7 @@ local function newset()
         insert = function(set, value)
             if not reverse[value] then
                 table.insert(set, value)
-                reverse[value] = table.getn(set)
+                reverse[value] = #set
             end
         end,
         remove = function(set, value)

etc/forward.lua

@@ -3,7 +3,7 @@ local dispatch = require("dispatch")
 local handler = dispatch.newhandler()
 
 -- make sure the user knows how to invoke us
-if table.getn(arg) < 1 then
+if #arg < 1 then
     print("Usage")
     print("    lua forward.lua <iport:ohost:oport> ...")
     os.exit(1)

etc/get.lua

@@ -135,7 +135,7 @@ end
 
 -- main program
 arg = arg or {}
-if table.getn(arg) < 1 then
+if #arg < 1 then
     io.write("Usage:\n  lua get.lua <remote-url> [<local-file>]\n")
     os.exit(1)
 else get(arg[1], arg[2]) end