use EOF with '' as escaping

src/build_dpkg.sh

@@ -40,7 +40,7 @@ mkdir -p $DEBIAN_DIR $LQOS_DIR/bin/static2 $ETC_DIR $MOTD_DIR
 
 # Create the Debian control file
 pushd $DEBIAN_DIR > /dev/null || exit
-cat <<EOF > control
+cat << EOF > control
 Package: $PACKAGE
 Version: $VERSION
 Architecture: amd64
@@ -53,7 +53,7 @@ popd > /dev/null || exit
 # Create the post-installation file
 pushd $DEBIAN_DIR > /dev/null || exit
 
-cat <<EOF > postinst
+cat << 'EOF' > postinst
 #!/bin/bash
 # Install Python Dependencies
 pushd /opt/libreqos  > /dev/null || exit
@@ -70,8 +70,8 @@ cp /opt/libreqos/src/bin/lqosd.service.example /etc/systemd/system/lqosd.service
 cp /opt/libreqos/src/bin/lqos_scheduler.service.example /etc/systemd/system/lqos_scheduler.service
 
 service_exists() {
-    local n=\$1
-    if [[ \$(systemctl list-units --all -t service --full --no-legend "$n.service" | sed 's/^\s*//g' | cut -f1 -d' ') == \$n.service ]]; then
+    local n=$1
+    if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | sed 's/^\s*//g' | cut -f1 -d' ') == $n.service ]]; then
         return 0
     else
         return 1
@@ -103,7 +103,7 @@ fi
 EOF
 
 # Uninstall Script
-cat <<EOF > postrm
+cat << EOF > postrm
 #!/bin/bash
 /bin/systemctl --no-block stop lqosd lqos_scheduler
 /bin/systemctl disable lqosd lqos_scheduler
@@ -145,9 +145,9 @@ popd || exit
 ####################################################
 # Add Message of the Day
 pushd $MOTD_DIR > /dev/null || exit
-cat <<EOF > 99-libreqos
+cat << 'EOF' > 99-libreqos
 #!/bin/bash
-MY_IP=\`hostname -I | cut -d' ' -f1\`
+MY_IP=`hostname -I | cut -d' ' -f1`
 echo -e "\nLibreQoS Traffic Shaper is installed on this machine.
 \nPoint a browser at http://\$MY_IP:9123/ to manage it.\n"
 EOF