diff --git a/install-release.sh b/install-release.sh
index 77aa6eb..352b74e 100644
--- a/install-release.sh
+++ b/install-release.sh
@@ -14,7 +14,7 @@ case "$(arch -s)" in
         ;;
 esac
 
-if [[ "$(command -v apk)" ]]; then
+if [ "$(command -v apk)" ]; then
     apk update
     apk add curl unzip
 else
@@ -27,12 +27,12 @@ ZIP_FILE="${TMP_DIRECTORY}v2ray-linux-$BIT.zip"
 DOWNLOAD_LINK="https://github.com/v2ray/v2ray-core/releases/latest/download/v2ray-linux-$BIT.zip"
 
 curl -L -H 'Cache-Control: no-cache' -o "$ZIP_FILE" "$DOWNLOAD_LINK" -#
-if [[ "$?" -ne '0' ]]; then
+if [ "$?" -ne '0' ]; then
     echo 'error: Download failed! Please check your network or try again.'
     exit 1
 fi
 curl -L -H 'Cache-Control: no-cache' -o "$ZIP_FILE.dgst" "$DOWNLOAD_LINK.dgst" -#
-if [[ "$?" -ne '0' ]]; then
+if [ "$?" -ne '0' ]; then
     echo 'error: Download failed! Please check your network or try again.'
     exit 1
 fi
@@ -41,7 +41,7 @@ fi
 for LISTSUM in 'md5' 'sha1' 'sha256' 'sha512'; do
     SUM="$(${LISTSUM}sum $ZIP_FILE | sed 's/ .*//')"
     CHECKSUM="$(grep $(echo $LISTSUM | tr [:lower:] [:upper:]) $ZIP_FILE.dgst | sed 's/.* //')"
-    if [[ "$SUM" != "$CHECKSUM" ]]; then
+    if [ "$SUM" != "$CHECKSUM" ]; then
         echo 'error: Check failed! Please check your network or try again.'
         exit 1
     fi
@@ -49,7 +49,8 @@ done
 
 unzip -q "$ZIP_FILE" -d "$TMP_DIRECTORY"
 
-if [[ -n "$(pgrep v2ray)" ]]; then
+V2RAY_RUNNING=
+if [ -n "$(pgrep v2ray)" ]; then
     rc-service v2ray stop
     V2RAY_RUNNING='1'
 fi
@@ -58,21 +59,24 @@ install -m 755 "${TMP_DIRECTORY}v2ctl" "/usr/local/bin/v2ctl"
 install -d /usr/local/lib/v2ray/
 install -m 755 "${TMP_DIRECTORY}geoip.dat" "/usr/local/lib/v2ray/geoip.dat"
 install -m 755 "${TMP_DIRECTORY}geosite.dat" "/usr/local/lib/v2ray/geosite.dat"
-if [[ ! -d '/usr/local/etc/v2ray/' ]]; then
+CONFDIR=
+if [ ! -d '/usr/local/etc/v2ray/' ]; then
     install -d /usr/local/etc/v2ray/
     for BASE in 00_log 01_api 02_dns 03_routing 04_policy 05_inbounds 06_outbounds 07_transport 08_stats 09_reverse; do
         echo '{}' > "/usr/local/etc/v2ray/$BASE.json"
     done
     CONFDIR='1'
 fi
-if [[ ! -d '/var/log/v2ray/' ]]; then
+LOG=
+if [ ! -d '/var/log/v2ray/' ]; then
     install -d -o nobody -g nobody /var/log/v2ray/
     LOG='1'
 fi
-if [[ ! -f '/etc/init.d/v2ray' ]]; then
+OPENRC=
+if [ ! -f '/etc/init.d/v2ray' ]; then
     mkdir "${TMP_DIRECTORY}init.d/"
     curl -o "${TMP_DIRECTORY}init.d/v2ray" https://raw.githubusercontent.workers.dev/v2fly/alpinelinux-install-v2ray/master/init.d/v2ray -s
-    if [[ "$?" -ne '0' ]]; then
+    if [ "$?" -ne '0' ]; then
         echo 'error: Failed to start service file download! Please check your network or try again.'
         exit 1
     fi
@@ -84,7 +88,7 @@ echo 'installed: /usr/local/bin/v2ray'
 echo 'installed: /usr/local/bin/v2ctl'
 echo 'installed: /usr/local/lib/v2ray/geoip.dat'
 echo 'installed: /usr/local/lib/v2ray/geosite.dat'
-if [[ "$CONFDIR" -eq '1' ]]; then
+if [ "$CONFDIR" -eq '1' ]; then
     echo 'installed: /usr/local/etc/v2ray/00_log.json'
     echo 'installed: /usr/local/etc/v2ray/01_api.json'
     echo 'installed: /usr/local/etc/v2ray/02_dns.json'
@@ -96,19 +100,18 @@ if [[ "$CONFDIR" -eq '1' ]]; then
     echo 'installed: /usr/local/etc/v2ray/08_stats.json'
     echo 'installed: /usr/local/etc/v2ray/09_reverse.json'
 fi
-if [[ "$LOG" -eq '1' ]]; then
+if [ "$LOG" -eq '1' ]; then
     echo 'installed: /var/log/v2ray/'
 fi
-if [[ "$OPENRC" -eq '1' ]]; then
+if [ "$OPENRC" -eq '1' ]; then
     echo 'installed: /etc/init.d/v2ray'
 fi
+rm -r "$TMP_DIRECTORY"
+echo "removed: $TMP_DIRECTORY"
 echo "You may need to execute a command to remove dependent software: apk del curl unzip"
-if [[ "$V2RAY_RUNNING" -eq '1' ]]; then
+if [ "$V2RAY_RUNNING" -eq '1' ]; then
     rc-service v2ray start
 else
     echo 'Please execute the command: rc-update add v2ray; rc-service v2ray start'
 fi
-
-rm -r "$TMP_DIRECTORY"
-echo "removed: $TMP_DIRECTORY"
 echo "info: V2Ray is installed."