diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index 9de13fb..740ee94 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -44,6 +44,16 @@ get_ipv6(){
     fi
 }
 
+get_char(){
+    SAVEDSTTY=`stty -g`
+    stty -echo
+    stty cbreak
+    dd if=/dev/tty bs=1 count=1 2> /dev/null
+    stty -raw
+    stty echo
+    stty $SAVEDSTTY
+}
+
 get_latest_version(){
     ver=$(wget --no-check-certificate -qO- https://api.github.com/repos/shadowsocks/shadowsocks-libev/releases/latest | grep 'tag_name' | cut -d\" -f4)
     [ -z ${ver} ] && echo "Error: Get shadowsocks-libev latest version failed" && exit 1
@@ -195,15 +205,7 @@ pre_install(){
         echo "Input error, please input correct numbers"
     fi
     done
-    get_char(){
-        SAVEDSTTY=`stty -g`
-        stty -echo
-        stty cbreak
-        dd if=/dev/tty bs=1 count=1 2> /dev/null
-        stty -raw
-        stty echo
-        stty $SAVEDSTTY
-    }
+
     echo
     echo "Press any key to start...or press Ctrl+C to cancel"
     char=`get_char`
diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index 952b0df..34cef21 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -44,6 +44,16 @@ get_ipv6(){
     fi
 }
 
+get_char(){
+    SAVEDSTTY=`stty -g`
+    stty -echo
+    stty cbreak
+    dd if=/dev/tty bs=1 count=1 2> /dev/null
+    stty -raw
+    stty echo
+    stty $SAVEDSTTY
+}
+
 get_latest_version(){
     ver=$(wget --no-check-certificate -qO- https://api.github.com/repos/shadowsocks/shadowsocks-libev/releases/latest | grep 'tag_name' | cut -d\" -f4)
     [ -z ${ver} ] && echo "Error: Get shadowsocks-libev latest version failed" && exit 1
@@ -226,15 +236,7 @@ pre_install(){
         echo "Input error, please input correct number"
     fi
     done
-    get_char(){
-        SAVEDSTTY=`stty -g`
-        stty -echo
-        stty cbreak
-        dd if=/dev/tty bs=1 count=1 2> /dev/null
-        stty -raw
-        stty echo
-        stty $SAVEDSTTY
-    }
+
     echo
     echo "Press any key to start...or press Ctrl+C to cancel"
     char=`get_char`
diff --git a/shadowsocks.sh b/shadowsocks.sh
index 1581c3f..8e786d5 100644
--- a/shadowsocks.sh
+++ b/shadowsocks.sh
@@ -117,6 +117,16 @@ get_ip(){
     [ ! -z ${IP} ] && echo ${IP} || echo
 }
 
+get_char(){
+    SAVEDSTTY=`stty -g`
+    stty -echo
+    stty cbreak
+    dd if=/dev/tty bs=1 count=1 2> /dev/null
+    stty -raw
+    stty echo
+    stty $SAVEDSTTY
+}
+
 # Pre-installation settings
 pre_install(){
     if check_sys packageManager yum || check_sys packageManager apt; then
@@ -160,15 +170,7 @@ pre_install(){
         echo "Input error, please input correct number"
     fi
     done
-    get_char(){
-        SAVEDSTTY=`stty -g`
-        stty -echo
-        stty cbreak
-        dd if=/dev/tty bs=1 count=1 2> /dev/null
-        stty -raw
-        stty echo
-        stty $SAVEDSTTY
-    }
+
     echo
     echo "Press any key to start...or Press Ctrl+C to cancel"
     char=`get_char`
diff --git a/shadowsocksR.sh b/shadowsocksR.sh
index d89066d..b760f08 100644
--- a/shadowsocksR.sh
+++ b/shadowsocksR.sh
@@ -117,6 +117,16 @@ get_ip(){
     [ ! -z ${IP} ] && echo ${IP} || echo
 }
 
+get_char(){
+    SAVEDSTTY=`stty -g`
+    stty -echo
+    stty cbreak
+    dd if=/dev/tty bs=1 count=1 2> /dev/null
+    stty -raw
+    stty echo
+    stty $SAVEDSTTY
+}
+
 # Pre-installation settings
 pre_install(){
     if check_sys packageManager yum || check_sys packageManager apt; then
@@ -160,15 +170,7 @@ pre_install(){
         echo "Input error, please input correct number"
     fi
     done
-    get_char(){
-        SAVEDSTTY=`stty -g`
-        stty -echo
-        stty cbreak
-        dd if=/dev/tty bs=1 count=1 2> /dev/null
-        stty -raw
-        stty echo
-        stty $SAVEDSTTY
-    }
+
     echo
     echo "Press any key to start...or Press Ctrl+C to cancel"
     char=`get_char`