.l
4 claimants
2 primary
2 secondary
shared primary (2)
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.
1.0M
total files
372.6K
first seen 2021–2025 (36.9%)
2020
median year (half its files since)
Case variants in archive: .l (1.0M), .L (8.9K) — aggregated above.
Attribution status
This extension is attributed to Lex; Picolisp as primary by 2 authoritative claims.
Authoritative sources: ✓ Linguist ✗ Pygments · no claim ✗ Wikidata · no claim △ Wikipedia · secondary
Claimants (6)
Languages that list
.l among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Lex | linguist | primary |
| Picolisp | linguist | primary |
| Lisp | linguist | secondary |
| Roff | linguist | secondary |
| Lisp | wikipedia | proposed |
| Picolisp | wikipedia | proposed |
Wikidata says… (1)
File formats, image formats, audio codecs and other non-PL
entities that claim
.l 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 |
|---|---|---|---|---|---|
| Lex source file Q126951646 file format | file format | — | — | — | Use as new PL ↗ |
Disambiguation rules (4)
Linguist heuristics that decide, by content, which language a
.l file actually is.| Rule | Predicts | Kind | Predicates (truncated) | Measured on SWH |
|---|---|---|---|---|
h/linguist/.l/0 | Lisp | predicates | [{"kind": "any", "regexes": ["\\(def(un|macro)\\s"]}] | |
h/linguist/.l/1 | Lex | predicates | [{"kind": "any", "regexes": ["^(%[%{}]xs|<.*>)"]}] | |
h/linguist/.l/2 | Roff | predicates | [{"kind": "any", "regexes": ["^\\.[A-Za-z]{2}(\\s|$)"]}] | |
h/linguist/.l/3 | Picolisp | predicates | [{"kind": "any", "regexes": ["^\\((de|class|rel|code|data|must)\\s"]}] |
SWH-mined examples (0)
No archived examples for .l in our local mirror yet.