# How to use the

## Function

BT interpreter to execute the `.bt` file. If `main.bt` exists in the current directory during startup, the file will be executed by default; otherwise, it will enter the command line interactive mode.

## Run and debug

```bt

// Output: hello world
print 'hello world'
```

 After installing the editor extension `bt-lang`, you can create `main.bt` in the project directory and run it directly.

## Command line execution

```bash
-c demo.bt
```

## Windows

 puts `bt.exe` in the project directory. When double-clicking to run, `main.bt` in the current directory will be executed first.

## Linux and macOS

```shell
cd /home/project
chmod +x bt
./bt
```

## Notes

-Script files uniformly use the `.bt` suffix.
 - Web services, desktop applications and normal CLI scripts all reuse the same BT language syntax.