diff --git a/reverse_expand_ipv4.js b/reverse_expand_ipv4.js
index 3c8477a..74b47c3 100644
--- a/reverse_expand_ipv4.js
+++ b/reverse_expand_ipv4.js
@@ -1,3 +1,4 @@
 function Rev4(str){
-    return srt.split(".").reverse().join(".") + ".in-addr.arpa"
+    return str.split(".").reverse().join(".") + ".in-addr.arpa"
 }
+
diff --git a/shell b/shell
new file mode 100755
index 0000000..b5ee83a
Binary files /dev/null and b/shell differ
diff --git a/shell.c b/shell.c
new file mode 100644
index 0000000..0a72d24
--- /dev/null
+++ b/shell.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    char *name[2];
+
+    name[0] = "/bin/sh";
+    name[1] = 0x0;
+    execve(name[0], name, 0x0);
+    exit(0);
+}