diff --git a/README.md b/README.md
index f18e318..dab50d6 100644
--- a/README.md
+++ b/README.md
@@ -27,28 +27,26 @@ installed: /etc/systemd/system/v2ray@.service
 
 ## 使用
 
-* 該腳本在執行時會提供 `info` 和 `error` 等信息，請仔細閱讀。
+* 該腳本在執行時會提供 `info`、`warning` 和 `error` 等信息，請仔細閱讀。
 
 ### 安裝和更新 V2Ray
 
 ```
 // 安裝執行檔和 .dat 資料檔
-# curl -LROJ https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-release.sh
-# bash install-release.sh
+# bash <(curl -H 'Cache-Control: no-cache' -L https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-release.sh)
 ```
 
 ### 安裝最新發行的 geoip.dat 和 geosite.dat
 
 ```
 // 只更新 .dat 資料檔
-# curl -LROJ https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-dat-release.sh
-# bash install-dat-release.sh
+# bash <(curl -H 'Cache-Control: no-cache' -L https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-dat-release.sh)
 ```
 
 ### 移除 V2Ray
 
 ```
-# bash install-release.sh --remove
+# bash <(curl -H 'Cache-Control: no-cache' -L https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-release.sh) --remove
 ```
 
 ### 解決問題
diff --git a/README.zh-Hans-CN.md b/README.zh-Hans-CN.md
index 411bf53..c12d4f4 100644
--- a/README.zh-Hans-CN.md
+++ b/README.zh-Hans-CN.md
@@ -27,28 +27,26 @@ installed: /etc/systemd/system/v2ray@.service
 
 ## 使用
 
-* 该脚本在运行时会提供 `info` 和 `error` 等信息，请仔细阅读。
+* 该脚本在运行时会提供 `info`、`warning` 和 `error` 等信息，请仔细阅读。
 
 ### 安装和更新 V2Ray
 
 ```
 // 安装可执行文件和 .dat 数据文件
-# curl -LROJ https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-release.sh
-# bash install-release.sh
+# bash <(curl -H 'Cache-Control: no-cache' -L https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-release.sh)
 ```
 
 ### 安装最新发行的 geoip.dat 和 geosite.dat
 
 ```
 // 只更新 .dat 数据文件
-# curl -LROJ https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-dat-release.sh
-# bash install-dat-release.sh
+# bash <(curl -H 'Cache-Control: no-cache' -L https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-dat-release.sh)
 ```
 
 ### 移除 V2Ray
 
 ```
-# bash install-release.sh --remove
+# bash <(curl -H 'Cache-Control: no-cache' -L https://raw.githubusercontent.com/v2fly/fhs-install-v2ray/master/install-release.sh) --remove
 ```
 
 ### 解决问题
diff --git a/install-release.sh b/install-release.sh
index 46e6ec0..8e9d5b2 100644
--- a/install-release.sh
+++ b/install-release.sh
@@ -23,6 +23,9 @@ JSON_PATH=${JSON_PATH:-/usr/local/etc/v2ray}
 # Set this variable only if you are starting v2ray with multiple configuration files:
 # export JSONS_PATH='/usr/local/etc/v2ray'
 
+# Set this variable only if you want this script to check all the systemd unit file:
+# export check_all_service_files='yes'
+
 curl() {
   $(type -P curl) -L -q --retry 5 --retry-delay 10 --retry-max-time 60 "$@"
 }
@@ -362,37 +365,39 @@ install_startup_service_file() {
   mkdir -p '/etc/systemd/system/v2ray.service.d'
   mkdir -p '/etc/systemd/system/v2ray@.service.d/'
   if [[ -n "$JSONS_PATH" ]]; then
-    echo "# Duplicate this file in the same directory and make your customizes there. Or all changes you made will be lost!
-## Refer: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
+    "rm" '/etc/systemd/system/v2ray.service.d/10-donot_touch_single_conf.conf' \
+      '/etc/systemd/system/v2ray@.service.d/10-donot_touch_single_conf.conf'
+    echo "# In case you have a good reason to do so, duplicate this file in the same directory and make your customizes there.
+# Or all changes you made will be lost!  # Refer: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
 [Service]
 ExecStart=
 ExecStart=/usr/local/bin/v2ray -confdir $JSONS_PATH" |
       tee '/etc/systemd/system/v2ray.service.d/10-donot_touch_multi_conf.conf' > \
         '/etc/systemd/system/v2ray@.service.d/10-donot_touch_multi_conf.conf'
   else
-    echo "${red}~~~~~~~~~~~~~~~~ ${green}/etc/systemd/system/v2ray.service.d/10-donot_touch_single_conf ${red}~~~~~~~~~~~~~~~~${reset}"
-    echo 'info: The following are the actual parameters for the v2ray service startup.'
-    echo 'info: Please make sure the configuration file path is correctly set.'
-    echo "# Duplicate this file in the same directory and make your customizes there. Or all changes you made will be lost!
-## Refer: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
+    "rm" '/etc/systemd/system/v2ray.service.d/10-donot_touch_multi_conf.conf' \
+      '/etc/systemd/system/v2ray@.service.d/10-donot_touch_multi_conf.conf'
+    echo "# In case you have a good reason to do so, duplicate this file in the same directory and make your customizes there.
+# Or all changes you made will be lost!  # Refer: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
 [Service]
 ExecStart=
-ExecStart=/usr/local/bin/v2ray -config ${JSON_PATH}/config.json" |
-      tee '/etc/systemd/system/v2ray.service.d/10-donot_touch_single_conf.conf'
-    echo
-    echo
-
-    echo "${red}~~~~~~~~~~~~~~~~ ${green}/etc/systemd/system/v2ray@.service.d/10-donot_touch_single_conf ${red}~~~~~~~~~~~~~~~~${reset}"
-    echo 'info: The following are the actual parameters for the v2ray service startup.'
-    echo 'info: Please make sure the configuration file path is correctly set.'
-    echo "# Duplicate this file in the same directory and make your customizes there. Or all changes you made will be lost!
-## Refer: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
+ExecStart=/usr/local/bin/v2ray -config ${JSON_PATH}/config.json" > \
+      '/etc/systemd/system/v2ray.service.d/10-donot_touch_single_conf.conf'
+    echo "# In case you have a good reason to do so, duplicate this file in the same directory and make your customizes there.
+# Or all changes you made will be lost!  # Refer: https://www.freedesktop.org/software/systemd/man/systemd.unit.html
 [Service]
 ExecStart=
-ExecStart=/usr/local/bin/v2ray -config ${JSON_PATH}/%i.json" |
-      tee '/etc/systemd/system/v2ray@.service.d/10-donot_touch_single_conf.conf'
+ExecStart=/usr/local/bin/v2ray -config ${JSON_PATH}/%i.json" > \
+      '/etc/systemd/system/v2ray@.service.d/10-donot_touch_single_conf.conf'
+  fi
+  echo "info: Systemd service files have been installed successfully!"
+  echo "${red}warning: ${green}The following are the actual parameters for the v2ray service startup."
+  echo "${red}warning: ${green}Please make sure the configuration file path is correctly set.${reset}"
+  systemd-analyze cat-config /etc/systemd/system/v2ray.service
+  if [[ x"${check_all_service_files:0:1}" = x'y' ]]; then
     echo
     echo
+    systemd-analyze cat-config /etc/systemd/system/v2ray@.service
   fi
   systemctl daemon-reload
   SYSTEMD='1'
@@ -515,7 +520,7 @@ main() {
   if [[ "$LOCAL_INSTALL" -eq '1' ]]; then
     echo 'warn: Install V2Ray from a local file, but still need to make sure the network is available.'
     echo -n 'warn: Please make sure the file is valid because we cannot confirm it. (Press any key) ...'
-    read
+    read -r
     install_software "$package_provide_bsdtar" 'bsdtar'
     decompression "$LOCAL_FILE"
   else