Lint sail script (#656)

bin/sail

@@ -128,8 +128,9 @@ else
 fi
 
 # Source the ".env" file so Laravel's environment variables are available...
-if [ ! -z "$APP_ENV" ] && [ -f ./.env.$APP_ENV ]; then
-  source ./.env.$APP_ENV;
+# shellcheck source=/dev/null
+if [ -n "$APP_ENV" ] && [ -f ./.env."$APP_ENV" ]; then
+  source ./.env."$APP_ENV";
 elif [ -f ./.env ]; then
   source ./.env;
 fi
@@ -159,8 +160,7 @@ function sail_is_not_running {
 }
 
 # Define Docker Compose command prefix...
-docker compose &> /dev/null
-if [ $? == 0 ]; then
+if docker compose &> /dev/null; then
     DOCKER_COMPOSE=(docker compose)
 else
     DOCKER_COMPOSE=(docker-compose)
@@ -560,7 +560,7 @@ elif [ "$1" == "open" ]; then
     shift 1
 
     if [ "$EXEC" == "yes" ]; then
-        open $APP_URL
+        open "$APP_URL"
 
         exit
     else