fix minor changes

install.sh

@@ -5,14 +5,14 @@ REQUIRED_PKGS=(file git bc)
 
 function usage() {
     echo 'usage: --host | --containers | --full | --one-container <CT_NAME>'
-    exit -1
+    exit 1
 }
 
 function install_host() {
     echo "install on: $HOSTNAME"
     echo ----------------------
 
-    [ $(id -u) -ne 0 ] && echo 'root privilege required' && exit 1
+    [ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 1
 
     if [[ ! $CURDIR == '/opt/debian-bash' ]]; then
         # download and filfull /opt/debian-bash, then run it from folder
@@ -24,14 +24,14 @@ function install_host() {
 
             rm -rf /opt/debian-bash
             TEMP=$(mktemp -d)
-            cd $TEMP
-            echo $TEMP
+            cd "$TEMP" || return
+            echo "$TEMP"
             wget https://git.artcode.re/pvincent/debian-bash/archive/master.tar.gz
             tar -xzf master.tar.gz
             mv debian-bash /opt/
-            cd /opt/debian-bash
-            ./install.sh $PARAM1
-            rm -rf $TEMP
+            cd /opt/debian-bash || return
+            ./install.sh "$PARAM1"
+            rm -rf "$TEMP"
             exit 0
         fi
 
@@ -50,7 +50,7 @@ function install_containers() {
     # install inside active LXC containers
     if [[ -f '/snap/bin/lxc' ]]; then
         for container in $(/snap/bin/lxc list --format=json | yq '.[] | select(.state.status == "Running") | .name' -); do
-            install_one_container $container
+            install_one_container "$container"
             echo
         done
     fi
@@ -80,8 +80,8 @@ case $PARAM1 in
     ;;
 "--one-container")
     CT=$2
-    if [ ! -z $CT ]; then
-        install_one_container $CT
+    if [ ! -z "$CT" ]; then
+        install_one_container "$CT"
     else
         usage
     fi