> For the complete documentation index, see [llms.txt](https://zaidlang.gitbook.io/z/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zaidlang.gitbook.io/z/standard-library/io.md).
# IO
Provides input and output facilities related to files.
### Methods
#### `io.append()`
Appends content to the specified file.
```typescript
io.append('./log.txt', 'message from ghost')
```
#### `io.read()`
Reads and returns the contents of the specified file as a string.
```typescript
io.read('./log.txt')
```
#### `io.write()`
Writes content to the specified file. This method completely overrides all content.
```typescript
io.write(content, './log.txt')
```