diff --git a/src/lib.rs b/src/lib.rs
index 50bfd55..82e2885 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,7 @@ use std::{
 
 pub mod util_io;
 pub mod util_os;
+pub mod util_env;
 pub mod util_cmd;
 pub mod util_msg;
 pub mod util_size;
diff --git a/src/util_env.rs b/src/util_env.rs
new file mode 100644
index 0000000..d81dd5c
--- /dev/null
+++ b/src/util_env.rs
@@ -0,0 +1,9 @@
+
+use std::env;
+
+pub fn is_env_on(var: &str) -> bool {
+    match env::var(var) {
+        Err(_) => false,
+        Ok(v) => (v == "TRUE" || v == "true" || v =="YES" || v == "yes" || v == "1"),
+    }
+}