diff --git a/tests/test_get_commands.sh b/tests/test_get_commands.sh
new file mode 100644
index 0000000..57dc45c
--- /dev/null
+++ b/tests/test_get_commands.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+setup() {
+	source ../zk
+}
+
+test_get_command_returns_list_for_substring() {
+	expected="list"
+
+	for arg in l li lis list; do
+		result="$(get_command "$arg")"
+		assert_equals "$expected" "$result"
+	done
+}
diff --git a/zk b/zk
index 580ce67..25409bc 100755
--- a/zk
+++ b/zk
@@ -1,5 +1,15 @@
 #!/bin/sh
 
+COMMANDS='list'
+
+get_command() {
+	for c in $COMMANDS; do
+		if echo "$c" | grep "$1" >/dev/null; then
+			echo "$c"
+		fi
+	done
+}
+
 main() {
 	echo "Hello, world"
 }