diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index e8b2901..a73ce1a 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -10,6 +10,7 @@
   - [apt](./basic/linux-command/apt.md)
   - [Vim](./basic/linux-command/vim.md)
   - [Git](./basic/linux-command/git.md)
+  - [Port](./basic/linux-command/port.md)
 
 # 伺服器與社網
 
diff --git a/src/basic/linux-command/port.md b/src/basic/linux-command/port.md
new file mode 100644
index 0000000..4fed453
--- /dev/null
+++ b/src/basic/linux-command/port.md
@@ -0,0 +1,6 @@
+# Port 相關指令
+
+我本來想寫 但我發現我忘光了
+這邊只有一個
+`sudo lsof -i -P -n | grep LISTEN`
+可以查看端口佔用情形