> For the complete documentation index, see [llms.txt](https://gemphonefarm.gitbook.io/gemphonefarm-book-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gemphonefarm.gitbook.io/gemphonefarm-book-1/huong-dan-su-dung/publish-your-docs/system-commands.md).

# System Commands

- [JavaScript code](https://gemphonefarm.gitbook.io/gemphonefarm-book-1/huong-dan-su-dung/publish-your-docs/system-commands/javascript-code.md): Block để viết code JS
- [Element exists](https://gemphonefarm.gitbook.io/gemphonefarm-book-1/huong-dan-su-dung/publish-your-docs/system-commands/element-exists.md): Kiểm tra một phần tử tồn tại trong trang hoạt động hay không
- [Press Key](https://gemphonefarm.gitbook.io/gemphonefarm-book-1/huong-dan-su-dung/publish-your-docs/system-commands/press-key.md): Phím nhấn đặc biệt
- [ADB Command](https://gemphonefarm.gitbook.io/gemphonefarm-book-1/huong-dan-su-dung/publish-your-docs/system-commands/adb-command.md): Yêu cầu ADB