Generalize automatic login example for Linux

examples/lua/automatic-linux-login.lua

@@ -0,0 +1,29 @@
+local logins = {
+    ["foo"] = {
+        username = "foouser",
+        password = "foopass",
+    },
+    ["bar"] = {
+        username = "baruser",
+        password = "barpass",
+    },
+    ["baz"] = {
+        username = "bazuser",
+        password = "bazpass",
+    },
+}
+
+local found, match_str = expect("\\w+- login:", 10)
+if (1 == found) then
+    local hostname = string.match(match_str, "^%w+")
+    local login = logins[hostname]
+    if (nil ~= login) then
+        send(login.username .. "\n")
+        expect("Password:")
+        send(login.password .. "\n")
+    else
+        print("\r\nDon't know login info for " .. hostname .. "\r\n")
+    end
+else
+    print("\r\nDidn't find a login prompt\r\n")
+end