.1
2 claimants
1 primary
1 secondary
unambiguous primary
SWH popularity
Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.
12.2M
total files
5.9M
first seen 2021–2025 (48.5%)
2020
median year (half its files since)
Attribution status
This extension is attributed to Roff Manpage as primary by 1 authoritative claim.
Authoritative sources: ✓ Linguist ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim
Claimants (2)
Languages that list
.1 among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Roff Manpage | linguist | primary |
| Roff | linguist | secondary |
Wikidata says… (4)
File formats, image formats, audio codecs and other non-PL
entities that claim
.1 on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| man page Q47512572 electronic documentation file format | file format | — | text/troff; application/x-troff-man | — | Use as new PL ↗ |
| Freedom of Press Bitamp Q28206147 file format | file format | — | — | — | Use as new PL ↗ |
| Freedom of Press Info Q28206138 file format | file format | — | — | — | Use as new PL ↗ |
Disambiguation rules (4)
Linguist heuristics that decide, by content, which language a
.1 file actually is.| Rule | Predicts | Kind | Predicates (truncated) | Measured on SWH |
|---|---|---|---|---|
h/linguist/.1/0 | Roff Manpage | predicates | [{"kind": "any", "regexes": ["^[.'][ \\t]*Dd +(?:[^\"\\s]+|\"[^\"]+\")"]}, {"kind": "any", "regexes": ["^[.'][ \\t]*Dt +(?:[^\"\\s]+|\"[^\"]+\") +\"?(?:[1-9]|@[^\\s@]+@)"]}, {"kind": "any", "regexes": | |
h/linguist/.1/1 | Roff Manpage | predicates | [{"kind": "any", "regexes": ["^[.'][ \\t]*TH +(?:[^\"\\s]+|\"[^\"]+\") +\"?(?:[1-9]|@[^\\s@]+@)"]}, {"kind": "any", "regexes": ["^[.'][ \\t]*SH +(?:[^\"\\s]+|\"[^\"\\s]+)"]}] | |
h/linguist/.1/2 | Roff | predicates | [{"kind": "any", "regexes": ["^\\.(?:[A-Za-z]{2}(?:\\s|$)|\\\\\")"]}] | |
h/linguist/.1/3 | Text | default | [] |
SWH-mined examples (0)
No archived examples for .1 in our local mirror yet.