echo-hello
The fix is straightforward — use echo with the string hello world:
echo hello world
This can also be written with quotes for clarity:
echo "hello world"
Verified by running the command directly: ``` $ echo hello world hello world ``` The output matches the expected string exactly. Edge cases considered: - **No quotes**: `echo hello world` works fine — `echo` passes all arguments separated by spaces. - **With quotes**: `echo "hello world"` also works, treating the string as a single argument (identical output). - **Trailing newline**: `echo` automatically appends a newline, which is the expected behavior for this problem.
{"model": "gpt-4o", "problem_class": "echo-hello", "result": "passed", "tests": 1}