diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 963943d..2ab3503 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,26 +1,10 @@
-# You can override the included template(s) by including variable overrides
-# SAST customization: https://docs.gitlab.com/ee/user/application_security/sast/#customizing-the-sast-settings
-# Secret Detection customization: https://docs.gitlab.com/ee/user/application_security/secret_detection/#customizing-settings
-# Dependency Scanning customization: https://docs.gitlab.com/ee/user/application_security/dependency_scanning/#customizing-the-dependency-scanning-settings
-# Container Scanning customization: https://docs.gitlab.com/ee/user/application_security/container_scanning/#customizing-the-container-scanning-settings
-# Note that environment variables can be set in several places
-# See https://docs.gitlab.com/ee/ci/variables/#cicd-variable-precedence
+image: golang:latest
+
 stages:
-- build
-- test
-- deploy
-- review
-- dast
-- staging
-- canary
-- production
-- incremental rollout 10%
-- incremental rollout 25%
-- incremental rollout 50%
-- incremental rollout 100%
-- performance
-- cleanup
-sast:
-  stage: test
-include:
-- template: Auto-DevOps.gitlab-ci.yml
+  - build
+
+job_build:
+  stage: build
+  script:
+  - go build console.go
+  
\ No newline at end of file
diff --git a/console.go b/console.go
index 2fc57db..1fa4212 100644
--- a/console.go
+++ b/console.go
@@ -95,11 +95,10 @@ func listener(port int) {
 			}
 		}
 	}()
-	fmt.Println("waiting exit")
-	aaaa := <-exit // 2. 尝试从通道中读取内容，若通道为空，则阻塞在此
+	exitsignal := <-exit // 2. 尝试从通道中读取内容，若通道为空，则阻塞在此
 	sstop <- "stop sender"
 	rstop <- "stop receiver"
-	fmt.Printf("command: %v\n", aaaa)
+	fmt.Printf("command: %v\n", exitsignal)
 	return
 }
 
@@ -256,10 +255,11 @@ func dial(host string, port int) {
 			}
 		}
 	}()
-	aaaa := <-exit //尝试从通道中读取内容，若通道为空，则阻塞在此
+
+	exitsignal := <-exit //尝试从通道中读取内容，若通道为空，则阻塞在此
 	sstop <- "stop sender"
 	rstop <- "stop receiver"
-	fmt.Printf("command: %v\n", aaaa)
+	fmt.Printf("command: %v\n", exitsignal)
 	return
 }
 
@@ -358,6 +358,16 @@ func sender(conn *net.TCPConn, exit chan string, receive chan int, sstop chan st
 		receive <- 1
 		return
 	}
+
+	if strings.HasPrefix(inp, "cd ..") {
+		fmt.Println("don't use .. change dir")
+		return
+	}
+
+	if strings.HasPrefix(inp, "cd .") {
+		fmt.Println("don't use . change dir")
+		return
+	}
 	conn.Write([]byte(inp))
 	receive <- 1
 	return