commit 89b777d5f56d2a5e4ae8fb7492ffda6958e901e4
Author: Ryan Cavicchioni <ryan@cavi.cc>
Date:   Sun Jan 26 00:08:46 2020 -0600

    add useful commands document

diff --git a/useful-commands.md b/useful-commands.md
new file mode 100644
index 0000000..dac59e3
--- /dev/null
+++ b/useful-commands.md
@@ -0,0 +1,5 @@
+# Useful commands
+
+```
+mtr -rwbzc 1.1.1.1
+```