# Generate Random Value
##  Generate Random Value
### Description
The File Exists transforms verifies the existence of a file. The filenames to check are read from pipeline fields.
The transform outputs a boolean flag field, indicating whether a file exists or doesn’t.
| Hop Engine | ✓ |
| ---------- | ------------ |
| Spark | ✓ |
| Flink | ✓ |
| Dataflow | ✓ |
### Options
| Option | Description |
| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Transform name | Name of the transform. |
| Seed | The seed to use for the random `number`, `integer` and `string` type. |
| Type | The type of data you want to get back:
- Random number : generates a random number between 0 and 1
- Random integer : generates a random 32-bit integer
- Random string : generates a random string based on a 64-bit long random value
- Universally Unique Identifier (UUID)
- Universally Unique Identifier type 4 (UUID4)
- Random Message Authentication Code (HmacMD5)
- Random Message Authentication Code (HmacSHA1)
|
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