# Script or data to be passed to the program following the shebang (#!) — file signature 23 21 at offset 0

For Script or data to be passed to the program following the shebang (#!), hex signature is 23 21; offset is 0, verified against its source on 2026-09-22.

- **Hex signature:** 23 21 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Format:** Script or data to be passed to the program following the shebang (#!) _(verified: appears in the quote below)_

## What the source says

> 23 21 | #! | 0 | | Script or data to be passed to the program following the shebang (#!) [1] |

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).