> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/h/hello-world/line_printer.md).

# Line printer

```ruby
Sys.open(\var fh, '>', '/dev/lp0') \
    && fh.say("Hello World!")      \
    && fh.close
```