> 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/w/write_entire_file.md).

# Write entire file

With error handling:

```ruby
var file = File(__FILE__)
file.open_w(\var fh, \var err) || die "Can't open #{file}: #{err}"
fh.print("Hello world!")       || die "Can't write to #{file}: #{$!}"
```

Without error handling:

```ruby
File(__FILE__).open_w.print("Hello world!")
```