TR (.tr)
.tr file signature | text/troff
TR is a troff markup source format associated with the Unix text formatting system, originally developed at Bell Labs and maintained through roff-compatible implementations. It is used to prepare manuals, technical documents, and formatted text for printing or terminal output, especially in Unix documentation workflows. As a plain-text legacy format, it is generally safe, though documents may invoke macros, includes, or shell-sensitive directives in processing environments.
Magic Bytes
Offset 0
2E 5C 22
Sources: Apache Tika
All Known Signatures
5 signature variants are documented for .tr files across multiple sources.
| Hex Signature | Offset | Sources |
|---|---|---|
| 2E 5C 22 | 0 | Apache Tika |
| 27 5C 22 | 0 | Apache Tika |
| 27 2E 5C 22 | 0 | Apache Tika |
| 5C 22 | 0 | Apache Tika |
| 27 27 27 | 0 | Apache Tika |
Extension
.tr
MIME Type
text/troff
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .tr files in Python
def is_tr(file_path: str) -> bool:
"""Check if file is a valid TR by magic bytes."""
signature = bytes([0x2E, 0x5C, 0x22])
with open(file_path, "rb") as f:
return f.read(3) == signatureHow to validate .tr files in Node.js
function isTR(buffer: Buffer): boolean {
const signature = Buffer.from([0x2E, 0x5C, 0x22]);
return buffer.subarray(0, 3).equals(signature);
}How to validate .tr files in Go
func IsTR(data []byte) bool {
signature := []byte{0x2E, 0x5C, 0x22}
if len(data) < 3 {
return false
}
return bytes.Equal(data[:3], signature)
}API Endpoint
/api/v1/tr
curl https://filesignature.org/api/v1/tr
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .tr file?
A .tr file is identified by the magic bytes 2E 5C 22 at byte offset 0. TR is a troff markup source format associated with the Unix text formatting system, originally developed at Bell Labs and maintained through roff-compatible implementations. It is used to prepare manuals, technical documents, and formatted text for printing or terminal output, especially in Unix documentation workflows. As a plain-text legacy format, it is generally safe, though documents may invoke macros, includes, or shell-sensitive directives in processing environments.
What are the magic bytes for .tr files?
The magic bytes for TR files are 2E 5C 22 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .tr file?
To validate a .tr file, read the first bytes of the file and compare them against the known magic bytes (2E 5C 22) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .tr files?
The primary MIME type for .tr files is text/troff.
Is it safe to open .tr files?
TR (.tr) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.