diff --git a/ab-nginx.sh b/ab-nginx.sh
index ad831f4..ae6636b 100755
--- a/ab-nginx.sh
+++ b/ab-nginx.sh
@@ -5,7 +5,7 @@
 #
 
 # text formatting presets
-if command -v tput > /dev/null; then
+if command -v tput >/dev/null; then
   cyan=$(tput bold)$(tput setaf 6)
   err=$(tput bold)$(tput setaf 1)
   magenta=$(tput sgr0)$(tput setaf 5)
@@ -21,7 +21,6 @@ else
   width=80
 fi
 
-
 ### parameter defaults
 shell=false
 container_name="ab-nginx"
@@ -34,54 +33,53 @@ unset SERVERS_DIR
 unset WEBROOT_DIR
 unset vmount
 
-
 ### functions
 
-checkExist () {
-    if [ "$1" = 'file' ]; then
-        if [ ! -f "$2" ]; then
-            printf "${err}\nCannot find file: '$2'. Exiting.\n${norm}"
-            exit 3
-        fi
-    elif [ "$1" = 'dir' ]; then
-        if [ ! -d "$2" ]; then
-            printf "${err}\nCannot find directory: '$2'. Exiting.\n${norm}"
-            exit 3
-        fi
+checkExist() {
+  if [ "$1" = 'file' ]; then
+    if [ ! -f "$2" ]; then
+      printf "%s\nCannot find file: '$2'. Exiting.\n%s" "$err" "$norm"
+      exit 3
     fi
-    return 0
+  elif [ "$1" = 'dir' ]; then
+    if [ ! -d "$2" ]; then
+      printf "%s\nCannot find directory: '$2'. Exiting.\n$%s" "$err" "$norm"
+      exit 3
+    fi
+  fi
+  return 0
 }
 
-scriptHelp () {
-    printf "\n%s%1000s\n" "$magenta" | tr " " "-" | cut -c -$width
-    printf "%s" "$norm"
-    textblock "This is a simple helper script so you can avoid lengthy typing when working with the nginx container. The script reads the contents of 'ab-nginx.params' and constructs various 'docker run' commands based on that file. The biggest time-saver is working with certificates. If they are specified in the params file, the script will automatically bind-mount them so nginx serves content via SSL by default."
-    newline
-    textblock "If you run the script with no parameters, it will execute the container 'normally': Run in detached mode with nginx automatically launched and logging to stdout.  If you specified certificates, nginx will serve over SSL by default."
-    newline
-    textblock "Note: Containers (except shell) are always set to restart 'unless-stopped'. You must remove them manually if desired."
-    printf "%s" "$magenta"
-    newline
-    textblock "The script has the following parameters:"
-    textblockParam 'parameter in cyan' 'default in yellow'
-    newline
-    textblockParam '-n|--name' 'ab-nginx'
-    textblock "Change the name of the container. This is cosmetic and does not affect operation in any way."
-    newline
-    textblockParam '-s|--shell' 'off: run in detached mode'
-    textblock "Enter the container using an interactive POSIX shell. This happens after startup operations but *before* nginx is actually started. This is a great way to see configuration changes possibly stopping nginx from starting normally."
-    printf "%s" "$yellow"
-    newline
-    textblock "More information can be found at: https://git.asifbacchus.app/ab-docker/ab-nginx/wiki"
-    printf "%s%1000s\n" "$magenta" | tr " " "-" | cut -c -$width
-    exit 0
+scriptHelp() {
+  printf "\n%s%1000s\n" "$magenta" | tr " " "-" | cut -c -$width
+  printf "%s" "$norm"
+  textblock "This is a simple helper script so you can avoid lengthy typing when working with the nginx container. The script reads the contents of 'ab-nginx.params' and constructs various 'docker run' commands based on that file. The biggest time-saver is working with certificates. If they are specified in the params file, the script will automatically bind-mount them so nginx serves content via SSL by default."
+  newline
+  textblock "If you run the script with no parameters, it will execute the container 'normally': Run in detached mode with nginx automatically launched and logging to stdout.  If you specified certificates, nginx will serve over SSL by default."
+  newline
+  textblock "Note: Containers (except shell) are always set to restart 'unless-stopped'. You must remove them manually if desired."
+  printf "%s" "$magenta"
+  newline
+  textblock "The script has the following parameters:"
+  textblockParam 'parameter in cyan' 'default in yellow'
+  newline
+  textblockParam '-n|--name' 'ab-nginx'
+  textblock "Change the name of the container. This is cosmetic and does not affect operation in any way."
+  newline
+  textblockParam '-s|--shell' 'off: run in detached mode'
+  textblock "Enter the container using an interactive POSIX shell. This happens after startup operations but *before* nginx is actually started. This is a great way to see configuration changes possibly stopping nginx from starting normally."
+  printf "%s" "$yellow"
+  newline
+  textblock "More information can be found at: https://git.asifbacchus.app/ab-docker/ab-nginx/wiki"
+  printf "%s%1000s\n" "$magenta" | tr " " "-" | cut -c -$width
+  exit 0
 }
 
-newline () {
+newline() {
   printf "\n"
 }
 
-textblock () {
+textblock() {
   printf "%s\n" "$1" | fold -w "$width" -s
 }
 
@@ -95,26 +93,25 @@ textblockParam() {
   fi
 }
 
-
 ### pre-requisite checks
 
 # is user root or in the docker group?
-if [ ! "$( id -u )" -eq 0 ]; then
-    if ! id -Gn | grep docker > /dev/null; then
-        printf "${err}\nYou must either be root or in the 'docker' group to run this script since you must be able to actually start the container! Exiting.\n${norm}"
-        exit 2
-    fi
+if [ ! "$(id -u)" -eq 0 ]; then
+  if ! id -Gn | grep docker >/dev/null; then
+    printf "%s\nYou must either be root or in the 'docker' group to run this script since you must be able to actually start the container! Exiting.\n$%s" "$err" "$norm"
+    exit 2
+  fi
 fi
 
 # does the params file exist?
 checkExist 'file' './ab-nginx.params'
 
 # read .params file
-. ./ab-nginx.params
+. "./ab-nginx.params"
 
 # fix case of TLS13_ONLY var
 if [ "$TLS13_ONLY" ]; then
-    TLS13_ONLY=$( printf "%s" "$TLS13_ONLY" | tr "[:lower:]" "[:upper:]" )
+  TLS13_ONLY=$(printf "%s" "$TLS13_ONLY" | tr "[:lower:]" "[:upper:]")
 fi
 
 # check for certs if using SSL
@@ -124,173 +121,170 @@ if [ "$SSL_CHAIN" ]; then checkExist 'file' "$SSL_CHAIN"; fi
 
 # check for DHparam if using TLS1.2
 if [ "$TLS13_ONLY" = 'FALSE' ]; then
-    if [ -z "$DH" ]; then
-        printf "${err}\nA DHparam file must be specified when using TLS 1.2. Exiting.${norm}\n"
-        exit 5
-    else
-        checkExist 'file' "$DH"
-    fi
+  if [ -z "$DH" ]; then
+    printf "%s\nA DHparam file must be specified when using TLS 1.2. Exiting.%s\n" "$err" "$norm"
+    exit 5
+  else
+    checkExist 'file' "$DH"
+  fi
 fi
 
 # check if specified config directory exists
 if [ "$CONFIG_DIR" ]; then
-    checkExist 'dir' "$CONFIG_DIR"
+  checkExist 'dir' "$CONFIG_DIR"
 fi
 
 # check if specified server-block directory exists
 if [ "$SERVERS_DIR" ]; then
-    checkExist 'dir' "$SERVERS_DIR"
+  checkExist 'dir' "$SERVERS_DIR"
 fi
 
 # check if specified webroot directory exists
 if [ "$WEBROOT_DIR" ]; then
-    checkExist 'dir' "$WEBROOT_DIR"
+  checkExist 'dir' "$WEBROOT_DIR"
 fi
 
 # set up volume mounts
 if [ "$CONFIG_DIR" ]; then
-    vmount="$vmount -v $CONFIG_DIR:/etc/nginx/config"
+  vmount="$vmount -v $CONFIG_DIR:/etc/nginx/config"
 fi
 if [ "$SERVERS_DIR" ]; then
-    vmount="$vmount -v $SERVERS_DIR:/etc/nginx/sites"
+  vmount="$vmount -v $SERVERS_DIR:/etc/nginx/sites"
 fi
 if [ "$SNIPPETS_DIR" ]; then
-    vmount="$vmount -v $SNIPPETS_DIR:/etc/nginx/snippets"
+  vmount="$vmount -v $SNIPPETS_DIR:/etc/nginx/snippets"
 fi
 if [ "$WEBROOT_DIR" ]; then
-    vmount="$vmount -v $WEBROOT_DIR:/usr/share/nginx/html"
+  vmount="$vmount -v $WEBROOT_DIR:/usr/share/nginx/html"
 fi
 # trim leading whitespace
 vmount=${vmount##[[:space:]]}
 
-
 # process startup parameters
 while [ $# -gt 0 ]; do
-    case "$1" in
-        -h|-\?|--help)
-            # display help
-            scriptHelp
-            exit 0
-            ;;
-        -s|--shell)
-            # start shell instead of default CMD
-            shell=true
-            ;;
-        -n|--name)
-            # container name
-            if [ -z "$2" ]; then
-                printf "${err}\nNo container name specified. Exiting.\n${norm}"
-                exit 1
-            fi
-            container_name="$2"
-            shift
-            ;;
-        *)
-            printf "${err}\nUnknown option: %s\n" "$1"
-            printf "Use '--help' for valid options.\n\n${norm}"
-            exit 1
-            ;;
-    esac
+  case "$1" in
+  -h | -\? | --help)
+    # display help
+    scriptHelp
+    exit 0
+    ;;
+  -s | --shell)
+    # start shell instead of default CMD
+    shell=true
+    ;;
+  -n | --name)
+    # container name
+    if [ -z "$2" ]; then
+      printf "%s\nNo container name specified. Exiting.\n%s" "$err" "$norm"
+      exit 1
+    fi
+    container_name="$2"
     shift
+    ;;
+  *)
+    printf "%s\nUnknown option: %s\n" "$err" "$1"
+    printf "Use '--help' for valid options.\n\n%s" "$norm"
+    exit 1
+    ;;
+  esac
+  shift
 done
 
 # create network if it doesn't already exist
-docker network inspect ${NETWORK} > /dev/null 2>&1 || \
-    docker network create \
-        --attachable \
-        --driver=bridge \
-        --subnet=${SUBNET} \
-        ${NETWORK}
-
+docker network inspect ${NETWORK} >/dev/null 2>&1 ||
+  docker network create \
+    --attachable \
+    --driver=bridge \
+    --subnet=${SUBNET} \
+    ${NETWORK}
 
 # run without TLS
-if [ -z "$SSL_CERT" ]; then    
-    if [ $shell = 'true' ]; then
-        # exec shell
-        printf "${cyan}\nRunning SHELL on %s...${norm}\n" "$container_name"
-        docker run --rm -it --name ${container_name} \
-            --env-file ab-nginx.params \
-            -e SERVER_NAMES="$HOSTNAMES" \
-            $vmount \
-            --network=${NETWORK} \
-            -p ${HTTP_PORT}:80 \
-            docker.asifbacchus.app/nginx/ab-nginx:latest /bin/sh
-    else
-        # exec normally
-        printf "${cyan}\nRunning NGINX on %s...${norm}\n" "$container_name"
-        docker run -d --name ${container_name} \
-        --env-file ab-nginx.params \
-        -e SERVER_NAMES="$HOSTNAMES" \
-        $vmount \
-        --network=${NETWORK} \
-        -p ${HTTP_PORT}:80 \
-        --restart unless-stopped \
-        docker.asifbacchus.app/nginx/ab-nginx:latest
-    fi
+if [ -z "$SSL_CERT" ]; then
+  if [ $shell = 'true' ]; then
+    # exec shell
+    printf "%s\nRunning SHELL on %s...%s\n" "$cyan" "$container_name" "$norm"
+    docker run --rm -it --name "${container_name}" \
+      --env-file ab-nginx.params \
+      -e SERVER_NAMES="$HOSTNAMES" \
+      "${vmount}" \
+      --network=${NETWORK} \
+      -p ${HTTP_PORT}:80 \
+      docker.asifbacchus.app/nginx/ab-nginx:latest /bin/sh
+  else
+    # exec normally
+    printf "%s\nRunning NGINX on %s...%s\n" "$cyan" "$container_name" "$norm"
+    docker run -d --name "${container_name}" \
+      --env-file ab-nginx.params \
+      -e SERVER_NAMES="$HOSTNAMES" \
+      "${vmount}" \
+      --network=${NETWORK} \
+      -p ${HTTP_PORT}:80 \
+      --restart unless-stopped \
+      docker.asifbacchus.app/nginx/ab-nginx:latest
+  fi
 # run with TLS1.2
 elif [ "$SSL_CERT" ] && [ "$TLS13_ONLY" = 'FALSE' ]; then
-    if [ $shell = 'true' ]; then
-        # exec shell
-        printf "${cyan}\nRunning SHELL on %s (TLS 1.2)...${norm}\n" "$container_name"
-        docker run --rm -it --name ${container_name} \
-            --env-file ab-nginx.params \
-            -e SERVER_NAMES="$HOSTNAMES" \
-            $vmount \
-            --network=${NETWORK} \
-            -v "$SSL_CERT":/certs/fullchain.pem:ro \
-            -v "$SSL_KEY":/certs/privkey.pem:ro \
-            -v "$SSL_CHAIN":/certs/chain.pem:ro \
-            -v "$DH":/certs/dhparam.pem:ro \
-            -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
-            docker.asifbacchus.app/nginx/ab-nginx:latest /bin/sh
-    else
-        # exec normally
-        printf "${cyan}\nRunning NGINX on %s (TLS 1.2)...${norm}\n" "$container_name"
-        docker run -d --name ${container_name} \
-            --env-file ab-nginx.params \
-            -e SERVER_NAMES="$HOSTNAMES" \
-            $vmount \
-            --network=${NETWORK} \
-            -v "$SSL_CERT":/certs/fullchain.pem:ro \
-            -v "$SSL_KEY":/certs/privkey.pem:ro \
-            -v "$SSL_CHAIN":/certs/chain.pem:ro \
-            -v "$DH":/certs/dhparam.pem:ro \
-            -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
-            --restart unless-stopped \
-            docker.asifbacchus.app/nginx/ab-nginx:latest
-    fi
+  if [ $shell = 'true' ]; then
+    # exec shell
+    printf "%s\nRunning SHELL on %s (TLS 1.2)...%s\n" "$cyan" "$container_name" "$norm"
+    docker run --rm -it --name "${container_name}" \
+      --env-file ab-nginx.params \
+      -e SERVER_NAMES="$HOSTNAMES" \
+      "${vmount}" \
+      --network=${NETWORK} \
+      -v "$SSL_CERT":/certs/fullchain.pem:ro \
+      -v "$SSL_KEY":/certs/privkey.pem:ro \
+      -v "$SSL_CHAIN":/certs/chain.pem:ro \
+      -v "$DH":/certs/dhparam.pem:ro \
+      -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
+      docker.asifbacchus.app/nginx/ab-nginx:latest /bin/sh
+  else
+    # exec normally
+    printf "%s\nRunning NGINX on %s (TLS 1.2)...%s\n" "$cyan" "$container_name" "$norm"
+    docker run -d --name "${container_name}" \
+      --env-file ab-nginx.params \
+      -e SERVER_NAMES="$HOSTNAMES" \
+      "${vmount}" \
+      --network=${NETWORK} \
+      -v "$SSL_CERT":/certs/fullchain.pem:ro \
+      -v "$SSL_KEY":/certs/privkey.pem:ro \
+      -v "$SSL_CHAIN":/certs/chain.pem:ro \
+      -v "$DH":/certs/dhparam.pem:ro \
+      -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
+      --restart unless-stopped \
+      docker.asifbacchus.app/nginx/ab-nginx:latest
+  fi
 # run with TLS1.3
 elif [ "$SSL_CERT" ] && [ "$TLS13_ONLY" = 'TRUE' ]; then
-    if [ $shell = 'true' ]; then
-        # exec shell
-        printf "${cyan}\nRunning SHELL on %s (TLS 1.3)...${norm}\n" "$container_name"
-        docker run --rm -it --name ${container_name} \
-            --env-file ab-nginx.params \
-            -e SERVER_NAMES="$HOSTNAMES" \
-            $vmount \
-            --network=${NETWORK} \
-            -v "$SSL_CERT":/certs/fullchain.pem:ro \
-            -v "$SSL_KEY":/certs/privkey.pem:ro \
-            -v "$SSL_CHAIN":/certs/chain.pem:ro \
-            -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
-            docker.asifbacchus.app/nginx/ab-nginx:latest /bin/sh
-    else
-        # exec normally
-        printf "${cyan}\nRunning NGINX on %s (TLS 1.3)...${norm}\n" "$container_name"
-        docker run -d --name ${container_name} \
-            --env-file ab-nginx.params \
-            -e SERVER_NAMES="$HOSTNAMES" \
-            $vmount \
-            --network=${NETWORK} \
-            -v "$SSL_CERT":/certs/fullchain.pem:ro \
-            -v "$SSL_KEY":/certs/privkey.pem:ro \
-            -v "$SSL_CHAIN":/certs/chain.pem:ro \
-            -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
-            --restart unless-stopped \
-            docker.asifbacchus.app/nginx/ab-nginx:latest
-    fi
+  if [ $shell = 'true' ]; then
+    # exec shell
+    printf "%s\nRunning SHELL on %s (TLS 1.3)...%s\n" "$cyan" "$container_name" "$norm"
+    docker run --rm -it --name "${container_name}" \
+      --env-file ab-nginx.params \
+      -e SERVER_NAMES="$HOSTNAMES" \
+      "${vmount}" \
+      --network=${NETWORK} \
+      -v "$SSL_CERT":/certs/fullchain.pem:ro \
+      -v "$SSL_KEY":/certs/privkey.pem:ro \
+      -v "$SSL_CHAIN":/certs/chain.pem:ro \
+      -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
+      docker.asifbacchus.app/nginx/ab-nginx:latest /bin/sh
+  else
+    # exec normally
+    printf "%s\nRunning NGINX on %s (TLS 1.3)...%s\n" "$cyan" "$container_name" "$norm"
+    docker run -d --name "${container_name}" \
+      --env-file ab-nginx.params \
+      -e SERVER_NAMES="$HOSTNAMES" \
+      "${vmount}" \
+      --network=${NETWORK} \
+      -v "$SSL_CERT":/certs/fullchain.pem:ro \
+      -v "$SSL_KEY":/certs/privkey.pem:ro \
+      -v "$SSL_CHAIN":/certs/chain.pem:ro \
+      -p ${HTTP_PORT}:80 -p ${HTTPS_PORT}:443 \
+      --restart unless-stopped \
+      docker.asifbacchus.app/nginx/ab-nginx:latest
+  fi
 fi
 
-
 ### exit gracefully
-exit 0
+exit 0
\ No newline at end of file