diff --git a/Cargo.lock b/Cargo.lock
index 145b937..b69efc6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -128,7 +128,7 @@ dependencies = [
 
 [[package]]
 name = "runrs"
-version = "0.1.8"
+version = "0.1.9"
 dependencies = [
  "rust_util",
  "sha256",
diff --git a/Cargo.toml b/Cargo.toml
index e716d0f..77aa17f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "runrs"
-version = "0.1.8"
+version = "0.1.9"
 edition = "2018"
 license = "MIT/Apache-2.0"
 description = "Run Rust Scripts"
diff --git a/README.md b/README.md
index 7d01e36..c50f34f 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ Environment variables
 | `HOME`        | User home, default by OS system                                |
 | `SKIP_CACHE`  | Skip compiled cached file , turn on `true`, `yes`, `on` or `1` |
 | `RUST_SCRIPT` | `rust_script` command line bin file                            |
+| `MAX_SCRIPT_LEN` | Max script length                                              |
 
 <br>
 
diff --git a/src/main.rs b/src/main.rs
index 4efa3a0..d632b64 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,16 +10,14 @@ use rust_util::{util_cmd, util_msg};
 use rust_util::util_msg::MessageType;
 
 fn main() {
-    let home = get_user_home();
-    let rust_script = get_run_script_bin_name(&home);
+    let user_home = get_user_home();
+    let rust_script = get_run_script_bin_name(&user_home);
 
     let args = env::args().skip(1).collect::<Vec<_>>();
     if args.is_empty() {
-        failure_and_exit!("runrs v{}, need arguments, e.g.\n\nrunrs <script.rs> [arguments]\n",
-            env!("CARGO_PKG_VERSION"),
-        );
+        failure_and_exit!("runrs v{}, need arguments, e.g.\n\nrunrs <script.rs> [arguments]\n", env!("CARGO_PKG_VERSION"));
     }
-    let first_argument = args.get(0).unwrap_or_else(|| failure_and_exit!("Must assign file name"));
+    let first_argument = args.get(0).unwrap_or_else(|| failure_and_exit!("Must assign a script file name"));
     if first_argument == "--help" {
         print_help();
         return;
@@ -29,15 +27,15 @@ fn main() {
     let (_, script_sha256) = read_file_and_digest(script_file);
     debugging!("File {} -> sha256: {}", script_file, script_sha256);
 
-    let cache_script_bin_name = format!("{}/Library/Caches/rust-script/binaries/release/{}", home, script_sha256);
+    let cache_script_bin_name = format!("{}/Library/Caches/rust-script/binaries/release/{}", user_home, script_sha256);
     let mut run_script_cmd = build_script_command(rust_script, script_file, &script_sha256, &cache_script_bin_name);
     for arg in args.iter().skip(1) {
         run_script_cmd.arg(arg);
     }
-    run_script_command(script_file, cache_script_bin_name, &mut run_script_cmd)
+    run_script_command(script_file, &cache_script_bin_name, &mut run_script_cmd)
 }
 
-fn build_script_command(rust_script: PathBuf, script_file: &String, script_sha256: &String, cache_script_bin_name: &String) -> Command {
+fn build_script_command(rust_script: PathBuf, script_file: &str, script_sha256: &str, cache_script_bin_name: &str) -> Command {
     let skip_cache = is_env_on("SKIP_CACHE");
     let cache_script_bin_name_exists = fs::metadata(&cache_script_bin_name).is_ok();
     debugging!("Bin name: {} {}exists", cache_script_bin_name, iff!(cache_script_bin_name_exists, "", "not "));
@@ -53,7 +51,7 @@ fn build_script_command(rust_script: PathBuf, script_file: &String, script_sha25
     }
 }
 
-fn run_script_command(script_file: &String, cache_script_bin_name: String, mut run_script_cmd: &mut Command) -> ! {
+fn run_script_command(script_file: &str, cache_script_bin_name: &str, mut run_script_cmd: &mut Command) -> ! {
     debugging!("Run command: {:?}", run_script_cmd);
     let run_command_start = SystemTime::now();
     match util_cmd::run_command_and_wait(&mut run_script_cmd) {
@@ -68,7 +66,7 @@ fn run_script_command(script_file: &String, cache_script_bin_name: String, mut r
     }
 }
 
-fn write_script_file_to_src(script_file: &String, cache_script_bin_name: String) {
+fn write_script_file_to_src(script_file: &str, cache_script_bin_name: &str) {
     if let Ok(Some(canonicalized_script_file)) = PathBuf::from(script_file)
         .canonicalize().map(|f| f.to_str().map(|f| f.to_string())) {
         let cache_script_bin_name_src = format!("{}.src", cache_script_bin_name);
@@ -99,11 +97,14 @@ runrs <script.rs> [arguments]
 }
 
 fn read_file_and_digest(script_file: &str) -> (String, String) {
+    let default_max_script_len = 1024 * 1024;
+    let max_script_len: u64 = env::var("MAX_SCRIPT_LEN")
+        .map(|len| len.parse().unwrap_or_else(|| default_max_script_len)).unwrap_or_else(|| default_max_script_len);
     match fs::metadata(script_file) {
         Err(_) => failure_and_exit!("Script file not exists: {}", script_file),
         Ok(metadata) => if metadata.is_dir() {
             failure_and_exit!("Assigned input is dir: {}", script_file);
-        } else if metadata.len() > 1024 * 1024 {
+        } else if metadata.len() > max_script_len {
             failure_and_exit!("Script file: {} too large: {}", script_file, metadata.len());
         }
     }