diff --git a/test/test_to_lower.py b/test/test_to_lower.py
new file mode 100644
index 0000000..4095c35
--- /dev/null
+++ b/test/test_to_lower.py
@@ -0,0 +1,25 @@
+"""Test to_lower function"""
+import pytest
+
+
+@pytest.mark.parametrize(
+    "case",
+    [
+        {"input": "abcdefghijklmnopqrstuvwxyz", "expected": "abcdefghijklmnopqrstuvwxyz"},
+        {"input": "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "expected": "abcdefghijklmnopqrstuvwxyz"},
+        {"input": "MixedCase", "expected": "mixedcase"},
+        {"input": "MixedCase", "expected": "mixedcase"},
+        {"input": "ABC abc Ɛ🤷 1234567890!@#$%^&*()-=+_ XYZ", "expected": "abc abc Ɛ🤷 1234567890!@#$%^&*()-=+_ xyz"},
+    ],
+)
+def test_get_mode(runner, yadm, case):
+    """Test function to_lower"""
+    script = f"""
+        YADM_TEST=1 source {yadm}
+        result=$(to_lower "{case["input"]}")
+        echo "RESULT:$result"
+    """
+    run = runner(command=["bash"], inp=script)
+    assert run.success
+    assert run.err == ""
+    assert f"RESULT:{case['expected']}\n" in run.out
diff --git a/yadm b/yadm
index 09da278..3c016ce 100755
--- a/yadm
+++ b/yadm
@@ -2131,6 +2131,25 @@ function mk_tmp_dir {
   echo "$tempdir"
 }
 
+function to_lower {
+  local str="$1"
+  local length="${#str}"
+
+  for ((i = 0; i < length; i++)); do
+    local char="${str:i:1}"
+    local ascii_val
+    ascii_val=$(printf "%d" "'$char'")
+
+    if ((ascii_val>=65 && ascii_val<=90)); then
+      ascii_val=$((ascii_val + 32))
+      # shellcheck disable=SC2059
+      printf "\\$(printf '%03o' "$ascii_val")"
+    else
+      printf '%s' "$char"
+    fi
+  done
+}
+
 # ****** Prerequisites Functions ******
 
 function require_archive() {