diff --git a/.gitignore b/.gitignore
index 6acb7f5..cd5fa58 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 build
 .directory
 .vscode
+.clangd
 v2ray_config/proxy
 v2ray_config/06_outbounds_proxy.json
 aur-*
diff --git a/src/cgproxy.cpp b/src/cgproxy.cpp
index 072dcd8..45936e0 100644
--- a/src/cgproxy.cpp
+++ b/src/cgproxy.cpp
@@ -1,14 +1,16 @@
+#include "common.hpp"
 #include "socket_client.hpp"
 #include <nlohmann/json.hpp>
 using json = nlohmann::json;
 using namespace CGPROXY;
 
-void print_usage() { 
-  fprintf(stdout, "Usage: cgproxy [--help] [--debug] [--noproxy] <CMD>\n"); 
-  fprintf(stdout, "Alias: cgnoproxy = cgproxy --noproxy\n"); 
+bool print_help = false, proxy = true;
+void print_usage() {
+  fprintf(stdout, "Usage: cgproxy [--help] [--debug] [--noproxy] <CMD>\n");
+  fprintf(stdout, "Alias: cgnoproxy = cgproxy --noproxy\n");
 }
 
-void processArgs(const int argc, char *argv[], int &shift, bool &proxy) {
+void processArgs(const int argc, char *argv[], int &shift) {
   for (int i = 1; i < argc; i++) {
     if (strcmp(argv[i], "--noproxy") == 0) { proxy = false; }
     if (strcmp(argv[i], "--debug") == 0) { enable_debug = true; }
@@ -18,9 +20,9 @@ void processArgs(const int argc, char *argv[], int &shift, bool &proxy) {
   }
 }
 
-bool attach2cgroup(pid_t pid,bool proxy) {
+bool attach2cgroup(pid_t pid, bool proxy) {
   json j;
-  j["type"] = proxy?MSG_TYPE_PROXY_PID:MSG_TYPE_NOPROXY_PID;
+  j["type"] = proxy ? MSG_TYPE_PROXY_PID : MSG_TYPE_NOPROXY_PID;
   j["data"] = pid;
   int status;
   SOCKET::send(j.dump(), status);
@@ -28,16 +30,16 @@ bool attach2cgroup(pid_t pid,bool proxy) {
 }
 
 int main(int argc, char *argv[]) {
-  if (argc == 1) {
-    error(
-        "usage: cgproxy [--debug] <CMD>\nexample: cgroxy curl -I https://www.google.com");
-    exit(EXIT_FAILURE);
+  int shift = 1;
+  processArgs(argc, argv, shift);
+
+  if (argc==shift||print_help) {
+    print_usage();
+    exit(0);
   }
 
-  int shift = 1; bool proxy=true;
-  processArgs(argc, argv, shift,proxy);
   pid_t pid = getpid();
-  if (!attach2cgroup(pid,proxy)) {
+  if (!attach2cgroup(pid, proxy)) {
     error("attach process failed");
     exit(EXIT_FAILURE);
   }
diff --git a/src/cgproxyd.cpp b/src/cgproxyd.cpp
index 53b4274..72f4639 100644
--- a/src/cgproxyd.cpp
+++ b/src/cgproxyd.cpp
@@ -121,7 +121,7 @@ public:
     debug("stopping");
     system(TPROXY_IPTABLS_CLEAN);
   }
-  
+
   ~cgproxyd() { stop(); }
 };
 
@@ -129,6 +129,10 @@ cgproxyd *cgproxyd::instance = NULL;
 
 } // namespace CGPROXY
 
+bool print_help = false;
+
+void print_usage() { printf("cgproxyd [--help] [--debug]\n"); }
+
 void processArgs(const int argc, char *argv[]) {
   for (int i = 1; i < argc; i++) {
     if (strcmp(argv[i], "--debug") == 0) { enable_debug = true; }
@@ -139,6 +143,10 @@ void processArgs(const int argc, char *argv[]) {
 
 int main(int argc, char *argv[]) {
   processArgs(argc, argv);
+  if (print_help) {
+    print_usage();
+    exit(0);
+  }
   CGPROXY::cgproxyd d;
   return d.start();
 }
\ No newline at end of file
diff --git a/src/common.hpp b/src/common.hpp
index b471f6c..2758b03 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -34,7 +34,6 @@
 using namespace std;
 
 static bool enable_debug = false;
-static bool print_help = false;
 
 #define error(...)                                                                       \
   {                                                                                      \
diff --git a/tools/cgattach.cpp b/tools/cgattach.cpp
index 7a9f970..b88130f 100644
--- a/tools/cgattach.cpp
+++ b/tools/cgattach.cpp
@@ -21,9 +21,9 @@ int main(int argc, char *argv[]) {
   string pid = string(argv[1]);
   string cgroup_target = string(argv[2]);
 
-  if (validPid(pid)&&validCgroup(cgroup_target)){
+  if (validPid(pid) && validCgroup(cgroup_target)) {
     CGPROXY::CGROUP::attach(pid, cgroup_target);
-  }else{
+  } else {
     error("param not valid");
     exit(EXIT_FAILURE);
   }