add fish config

fish/add-on.fish

@@ -129,6 +129,22 @@ function sudo --description "Replacement for sudo that preserves custom PATH com
     end
 end
 
+function portcheck
+    # 设置起始端口，如果没有传入参数则默认为 8840
+    set -l port 8840
+    if test (count $argv) -gt 0
+        set port $argv[1]
+    end
+
+    # 循环检查端口是否被占用
+    # -t: TCP, -u: UDP, -l: Listening, -n: Numeric
+    while ss -tuln | grep -q ":$port "
+        set port (math $port + 1)
+    end
+
+    echo $port
+end
+
 abbr -a port 'sudo ss -tulnp | grep'
 abbr -a process 'ps aux | grep'