add useful commands document

2020-01-26 00:08:46 -06:00
commit 89b777d5f5
1 changed files with 5 additions and 0 deletions
--- a/useful-commands.md
+++ b/useful-commands.md
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+# Useful commands
+
+```
+mtr -rwbzc 1.1.1.1
+```