diff --git a/shadowsocks-all.sh b/shadowsocks-all.sh
index d8790cb..65de316 100644
--- a/shadowsocks-all.sh
+++ b/shadowsocks-all.sh
@@ -857,10 +857,10 @@ action=$1
 [ -z $1 ] && action=install
 case "$action" in
     install|uninstall)
-    ${action}_shadowsocks
-    ;;
+        ${action}_shadowsocks
+        ;;
     *)
-    echo "Arguments error! [${action}]"
-    echo "Usage: `basename $0` [install|uninstall]"
-    ;;
+        echo "Arguments error! [${action}]"
+        echo "Usage: `basename $0` [install|uninstall]"
+        ;;
 esac
diff --git a/shadowsocks-go.sh b/shadowsocks-go.sh
index adfd745..c8ac131 100644
--- a/shadowsocks-go.sh
+++ b/shadowsocks-go.sh
@@ -376,10 +376,10 @@ action=$1
 [ -z $1 ] && action=install
 case "$action" in
     install|uninstall)
-    ${action}_shadowsocks_go
-    ;;
+        ${action}_shadowsocks_go
+        ;;
     *)
-    echo "Arguments error! [${action}]"
-    echo "Usage: `basename $0` {install|uninstall}"
-    ;;
+        echo "Arguments error! [${action}]"
+        echo "Usage: `basename $0` [install|uninstall]"
+        ;;
 esac
diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index 705b272..0567370 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -387,14 +387,11 @@ uninstall_shadowsocks_libev(){
 action=$1
 [ -z $1 ] && action=install
 case "$action" in
-    install)
-    install_shadowsocks_libev
-    ;;
-    uninstall)
-    uninstall_shadowsocks_libev
-    ;;
+    install|uninstall)
+        ${action}_shadowsocks_libev
+        ;;
     *)
-    echo "Arguments error! [${action}]"
-    echo "Usage: `basename $0` {install|uninstall}"
-    ;;
+        echo "Arguments error! [${action}]"
+        echo "Usage: `basename $0` [install|uninstall]"
+        ;;
 esac
diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index 2674bdc..a9b2040 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -447,14 +447,11 @@ install_shadowsocks_libev(){
 action=$1
 [ -z $1 ] && action=install
 case "$action" in
-    install)
-    install_shadowsocks_libev
-    ;;
-    uninstall)
-    uninstall_shadowsocks_libev
-    ;;
+    install|uninstall)
+        ${action}_shadowsocks_libev
+        ;;
     *)
-    echo "Arguments error! [${action}]"
-    echo "Usage: `basename $0` {install|uninstall}"
-    ;;
+        echo "Arguments error! [${action}]"
+        echo "Usage: `basename $0` [install|uninstall]"
+        ;;
 esac
diff --git a/shadowsocks.sh b/shadowsocks.sh
index 8e786d5..28d32ef 100644
--- a/shadowsocks.sh
+++ b/shadowsocks.sh
@@ -378,10 +378,10 @@ action=$1
 [ -z $1 ] && action=install
 case "$action" in
     install|uninstall)
-    ${action}_shadowsocks
-    ;;
+        ${action}_shadowsocks
+        ;;
     *)
-    echo "Arguments error! [${action}]"
-    echo "Usage: `basename $0` {install|uninstall}"
+        echo "Arguments error! [${action}]"
+        echo "Usage: `basename $0` [install|uninstall]"
     ;;
 esac
diff --git a/shadowsocksR.sh b/shadowsocksR.sh
index b760f08..5124565 100644
--- a/shadowsocksR.sh
+++ b/shadowsocksR.sh
@@ -379,10 +379,10 @@ action=$1
 [ -z $1 ] && action=install
 case "$action" in
     install|uninstall)
-    ${action}_shadowsocks
-    ;;
+        ${action}_shadowsocks
+        ;;
     *)
-    echo "Arguments error! [${action}]"
-    echo "Usage: `basename $0` {install|uninstall}"
-    ;;
+        echo "Arguments error! [${action}]"
+        echo "Usage: `basename $0` [install|uninstall]"
+        ;;
 esac