diff --git a/configure.sh b/configure.sh
index 7a6b964..87d97da 100755
--- a/configure.sh
+++ b/configure.sh
@@ -4,7 +4,7 @@ set -e
 SCRIPT=$(readlink -f "$0")
 AWD=$(dirname "$SCRIPT")
 
-DISTRO_PVE=$((command -v pvesh &>/dev/null && echo 1) || echo 0)
+DISTRO_PVE=$($(command -v pvesh &>/dev/null) && echo 1 || echo 0)
 
 configure(){
     echo "Asia/Shanghai" | tee /etc/timezone >/dev/null
diff --git a/init.sh b/init.sh
index 51efeda..e913a63 100755
--- a/init.sh
+++ b/init.sh
@@ -12,7 +12,7 @@ esac
 if [ -z $OS_VERSION ]; then
     echo "Unsupported Debian Code: $OS_CODE" && exit 1
 fi
-DISTRO_PVE=$((command -v pvesh &>/dev/null && echo 1) || echo 0)
+DISTRO_PVE=$($(command -v pvesh &>/dev/null) && echo 1 || echo 0)
 
 SCRIPT=$(readlink -f "$0")
 AWD=$(dirname "$SCRIPT")
diff --git a/install.sh b/install.sh
index cb8e8d6..318545d 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-cmd=$((command -v nala &>/dev/null && echo "nala") || echo "apt")
+cmd=$($(command -v nala &>/dev/null) && echo "nala" || echo "apt")
 $cmd update
 fd="$1"
 apt-cache search '' | awk '{print $1}' | grep -Ex $(echo $(cat $fd | tr '\n' '|' | sed 's/ //g')) |  xargs -r $cmd install --no-install-recommends -y