Arduino Reference - FilePeek

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SD : File class

## peek()

Read a byte from the file without advancing to the next one. That is, successive calls to peek() will return the same value, as will the next call to read().

peek() inherits from the Stream utility class.

#### Syntax

file.peek()

#### Parameters

file: an instance of the File class (returned by SD.open())

#### Returns

The next byte (or character), or -1 if none is available.

#### See Also

- available()
- read()
- write()
- Stream.peek()
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