Translated uname.php and uptime.php to Lua.

uptime/uptime.lua

@@ -0,0 +1,22 @@
+---
+permalink: /cgi/uptime/index.lua
+---
+
+-- Function to execute shell commands
+local function shell_exec(command)
+    local handle = io.popen(command)
+    local result = handle:read("*a")
+    handle:close()
+    return result
+end
+
+-- Execute shell commands
+local uptime = shell_exec('uptime')
+local version = shell_exec('uptime -V')
+
+-- Output the HTTP header
+io.write("Content-Type: text/plain; charset=utf-8\r\n\r\n")
+
+-- Output the result
+io.write('Server ' .. version:sub(1, -2) .. ': ' .. uptime)
+