diff --git a/shadowsocks-all.sh b/shadowsocks-all.sh
index 19c2285..e1457b6 100644
--- a/shadowsocks-all.sh
+++ b/shadowsocks-all.sh
@@ -592,17 +592,14 @@ install_prepare_port() {
     [ -z "${shadowsocksport}" ] && shadowsocksport="8989"
     expr ${shadowsocksport} + 1 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ] && [ ${shadowsocksport:0:1} != 0 ]; then
             echo
             echo "port = ${shadowsocksport}"
             echo
             break
-        else
-            echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
         fi
-    else
-        echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     fi
+    echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     done
 }
 
@@ -620,11 +617,11 @@ install_prepare_cipher() {
         [ -z "$pick" ] && pick=1
         expr ${pick} + 1 &>/dev/null
         if [ $? -ne 0 ]; then
-            echo -e "[${red}Error${plain}] Input error, please input a number"
+            echo -e "[${red}Error${plain}] Please enter a number"
             continue
         fi
         if [[ "$pick" -lt 1 || "$pick" -gt ${#common_ciphers[@]} ]]; then
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#common_ciphers[@]}"
+            echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#common_ciphers[@]}"
             continue
         fi
         shadowsockscipher=${common_ciphers[$pick-1]}
@@ -637,11 +634,11 @@ install_prepare_cipher() {
         [ -z "$pick" ] && pick=2
         expr ${pick} + 1 &>/dev/null
         if [ $? -ne 0 ]; then
-            echo -e "[${red}Error${plain}] Input error, please input a number"
+            echo -e "[${red}Error${plain}] Please enter a number"
             continue
         fi
         if [[ "$pick" -lt 1 || "$pick" -gt ${#r_ciphers[@]} ]]; then
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#r_ciphers[@]}"
+            echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#r_ciphers[@]}"
             continue
         fi
         shadowsockscipher=${r_ciphers[$pick-1]}
@@ -654,11 +651,11 @@ install_prepare_cipher() {
         [ -z "$pick" ] && pick=1
         expr ${pick} + 1 &>/dev/null
         if [ $? -ne 0 ]; then
-            echo -e "[${red}Error${plain}] Input error, please input a number"
+            echo -e "[${red}Error${plain}] Please enter a number"
             continue
         fi
         if [[ "$pick" -lt 1 || "$pick" -gt ${#go_ciphers[@]} ]]; then
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#go_ciphers[@]}"
+            echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#go_ciphers[@]}"
             continue
         fi
         shadowsockscipher=${go_ciphers[$pick-1]}
@@ -683,11 +680,11 @@ install_prepare_protocol() {
     [ -z "$protocol" ] && protocol=1
     expr ${protocol} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$protocol" -lt 1 || "$protocol" -gt ${#protocols[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#protocols[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#protocols[@]}"
         continue
     fi
     shadowsockprotocol=${protocols[$protocol-1]}
@@ -710,11 +707,11 @@ install_prepare_obfs() {
     [ -z "$r_obfs" ] && r_obfs=1
     expr ${r_obfs} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$r_obfs" -lt 1 || "$r_obfs" -gt ${#obfs[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#obfs[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#obfs[@]}"
         continue
     fi
     shadowsockobfs=${obfs[$r_obfs-1]}
@@ -757,11 +754,11 @@ install_prepare_libev_obfs() {
             [ -z "$r_libev_obfs" ] && r_libev_obfs=1
             expr ${r_libev_obfs} + 1 &>/dev/null
             if [ $? -ne 0 ]; then
-                echo -e "[${red}Error${plain}] Input error, please input a number"
+                echo -e "[${red}Error${plain}] Please enter a number"
                 continue
             fi
             if [[ "$r_libev_obfs" -lt 1 || "$r_libev_obfs" -gt ${#obfs_libev[@]} ]]; then
-                echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#obfs_libev[@]}"
+                echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#obfs_libev[@]}"
                 continue
             fi
             shadowsocklibev_obfs=${obfs_libev[$r_libev_obfs-1]}
diff --git a/shadowsocks-go.sh b/shadowsocks-go.sh
index 5058e2b..5e46207 100644
--- a/shadowsocks-go.sh
+++ b/shadowsocks-go.sh
@@ -155,7 +155,7 @@ pre_install(){
         exit 1
     fi
     # Set shadowsocks-go config password
-    echo "Please input password for shadowsocks-go:"
+    echo "Please enter password for shadowsocks-go:"
     read -p "(Default password: teddysun.com):" shadowsockspwd
     [ -z "${shadowsockspwd}" ] && shadowsockspwd="teddysun.com"
     echo
@@ -166,24 +166,21 @@ pre_install(){
     # Set shadowsocks-go config port
     while true
     do
-    echo -e "Please input port for shadowsocks-go [1-65535]:"
+    echo -e "Please enter a port for shadowsocks-go [1-65535]:"
     read -p "(Default port: 8989):" shadowsocksport
     [ -z "${shadowsocksport}" ] && shadowsocksport="8989"
     expr ${shadowsocksport} + 1 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ] && [ ${shadowsocksport:0:1} != 0 ]; then
             echo
             echo "---------------------------"
             echo "port = ${shadowsocksport}"
             echo "---------------------------"
             echo
             break
-        else
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
         fi
-    else
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
     fi
+    echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     done
 
     # Set shadowsocks config stream ciphers
@@ -198,11 +195,11 @@ pre_install(){
     [ -z "$pick" ] && pick=1
     expr ${pick} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$pick" -lt 1 || "$pick" -gt ${#ciphers[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#ciphers[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#ciphers[@]}"
         continue
     fi
     shadowsockscipher=${ciphers[$pick-1]}
diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index 5aa0f63..7ee5207 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -234,24 +234,21 @@ pre_install(){
     # Set shadowsocks-libev config port
     while true
     do
-    echo -e "Please input port for shadowsocks-libev [1-65535]:"
+    echo -e "Please enter a port for shadowsocks-libev [1-65535]:"
     read -p "(Default port: 8989):" shadowsocksport
     [ -z "$shadowsocksport" ] && shadowsocksport="8989"
     expr ${shadowsocksport} + 1 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ] && [ ${shadowsocksport:0:1} != 0 ]; then
             echo
             echo "---------------------------"
             echo "port = ${shadowsocksport}"
             echo "---------------------------"
             echo
             break
-        else
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
         fi
-    else
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
     fi
+    echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     done
 
     # Set shadowsocks config stream ciphers
@@ -266,11 +263,11 @@ pre_install(){
     [ -z "$pick" ] && pick=1
     expr ${pick} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$pick" -lt 1 || "$pick" -gt ${#ciphers[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#ciphers[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#ciphers[@]}"
         continue
     fi
     shadowsockscipher=${ciphers[$pick-1]}
diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index d34b11d..7b221b5 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -250,7 +250,7 @@ pre_install(){
     fi
 
     # Set shadowsocks-libev config password
-    echo "Please input password for shadowsocks-libev:"
+    echo "Please enter password for shadowsocks-libev:"
     read -p "(Default password: teddysun.com):" shadowsockspwd
     [ -z "${shadowsockspwd}" ] && shadowsockspwd="teddysun.com"
     echo
@@ -262,24 +262,21 @@ pre_install(){
     # Set shadowsocks-libev config port
     while true
     do
-    echo -e "Please input port for shadowsocks-libev [1-65535]:"
+    echo -e "Please enter a port for shadowsocks-libev [1-65535]:"
     read -p "(Default port: 8989):" shadowsocksport
     [ -z "$shadowsocksport" ] && shadowsocksport="8989"
     expr ${shadowsocksport} + 1 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ] && [ ${shadowsocksport:0:1} != 0 ]; then
             echo
             echo "---------------------------"
             echo "port = ${shadowsocksport}"
             echo "---------------------------"
             echo
             break
-        else
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
         fi
-    else
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
     fi
+    echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     done
 
     # Set shadowsocks config stream ciphers
@@ -294,11 +291,11 @@ pre_install(){
     [ -z "$pick" ] && pick=1
     expr ${pick} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$pick" -lt 1 || "$pick" -gt ${#ciphers[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#ciphers[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#ciphers[@]}"
         continue
     fi
     shadowsockscipher=${ciphers[$pick-1]}
diff --git a/shadowsocks.sh b/shadowsocks.sh
index fd5e26d..6759bfe 100644
--- a/shadowsocks.sh
+++ b/shadowsocks.sh
@@ -162,7 +162,7 @@ pre_install(){
         exit 1
     fi
     # Set shadowsocks config password
-    echo "Please input password for shadowsocks-python"
+    echo "Please enter password for shadowsocks-python"
     read -p "(Default password: teddysun.com):" shadowsockspwd
     [ -z "${shadowsockspwd}" ] && shadowsockspwd="teddysun.com"
     echo
@@ -173,24 +173,21 @@ pre_install(){
     # Set shadowsocks config port
     while true
     do
-    echo "Please input port for shadowsocks-python [1-65535]"
+    echo "Please enter a port for shadowsocks-python [1-65535]"
     read -p "(Default port: 8989):" shadowsocksport
     [ -z "$shadowsocksport" ] && shadowsocksport="8989"
     expr ${shadowsocksport} + 1 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ] && [ ${shadowsocksport:0:1} != 0 ]; then
             echo
             echo "---------------------------"
             echo "port = ${shadowsocksport}"
             echo "---------------------------"
             echo
             break
-        else
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
         fi
-    else
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
     fi
+    echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     done
 
     # Set shadowsocks config stream ciphers
@@ -205,11 +202,11 @@ pre_install(){
     [ -z "$pick" ] && pick=1
     expr ${pick} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$pick" -lt 1 || "$pick" -gt ${#ciphers[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#ciphers[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#ciphers[@]}"
         continue
     fi
     shadowsockscipher=${ciphers[$pick-1]}
diff --git a/shadowsocksR.sh b/shadowsocksR.sh
index 73768e8..bba5e1b 100644
--- a/shadowsocksR.sh
+++ b/shadowsocksR.sh
@@ -186,7 +186,7 @@ pre_install(){
         exit 1
     fi
     # Set ShadowsocksR config password
-    echo "Please input password for ShadowsocksR:"
+    echo "Please enter password for ShadowsocksR:"
     read -p "(Default password: teddysun.com):" shadowsockspwd
     [ -z "${shadowsockspwd}" ] && shadowsockspwd="teddysun.com"
     echo
@@ -197,24 +197,21 @@ pre_install(){
     # Set ShadowsocksR config port
     while true
     do
-    echo -e "Please input port for ShadowsocksR [1-65535]:"
+    echo -e "Please enter a port for ShadowsocksR [1-65535]:"
     read -p "(Default port: 8989):" shadowsocksport
     [ -z "${shadowsocksport}" ] && shadowsocksport="8989"
     expr ${shadowsocksport} + 1 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ] && [ ${shadowsocksport:0:1} != 0 ]; then
             echo
             echo "---------------------------"
             echo "port = ${shadowsocksport}"
             echo "---------------------------"
             echo
             break
-        else
-            echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
         fi
-    else
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and 65535"
     fi
+    echo -e "[${red}Error${plain}] Please enter a correct number [1-65535]"
     done
 
     # Set shadowsocksR config stream ciphers
@@ -229,11 +226,11 @@ pre_install(){
     [ -z "$pick" ] && pick=2
     expr ${pick} + 1 &>/dev/null
     if [ $? -ne 0 ]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number"
+        echo -e "[${red}Error${plain}] Please enter a number"
         continue
     fi
     if [[ "$pick" -lt 1 || "$pick" -gt ${#ciphers[@]} ]]; then
-        echo -e "[${red}Error${plain}] Input error, please input a number between 1 and ${#ciphers[@]}"
+        echo -e "[${red}Error${plain}] Please enter a number between 1 and ${#ciphers[@]}"
         continue
     fi
     shadowsockscipher=${ciphers[$pick-1]}