fstintersect(1)

✨ NAME ✨

ok so fstintersect — it computes the intersection of two FSAs 💅 that's it, that's the whole job, and she does it flawlessly.

---

🦋 SYNOPSIS 🦋

fstintersect [OPTIONS] in1.fst in2.fst [out.fst]

---

💖 DESCRIPTION 💖

bestie. she intersects two FSAs. that's the vibe. two finite-state acceptors go in, their intersection comes out, no cap 🫶

---

👑 OPTIONS 👑

quick lil heads up bestie: boolean options can take either true or false as a value, OR if you don't give them a value at all they just quietly assume true. periodt. ✨

• --compose_filter[=TYPE] — sets the composition filter, and she's gotta be one of alt_sequence, auto, match, or sequence. Default: auto.
• --connect[=BOOLEAN] — trims the output. Default: true.
• --fst_align[=BOOLEAN] — writes FST data aligned where appropriate. Default: false.
• --fst_compat_symbols[=BOOLEAN] — requires symbol tables to match when appropriate. Default: true.
• --fst_default_cache_gc[=BOOLEAN] — enables garbage collection of the cache (she's tidy like that 🧹). Default: true.
• --fst_default_cache_gc_limit=N — sets the cache byte size that triggers that garbage collection. Default: 1048576.
• --fst_error_fatal[=BOOLEAN] — if true, FST errors are fatal. otherwise, the returned objects get flagged as bad — like, FSTs come back with the kError property set to true, and FST weights get set so that Member() returns false. Default: true.
• --fst_field_separator=STRING — sets the characters used as a separator between printed fields. Default: " ".
• --fst_read_mode=STRING — sets the default file reading mode for mappable files, either "read" or "map". Default: "read".
• --fst_verify_properties[=BOOLEAN] — verifies the fst properties queried by TestProperties. Default: false.
• --fst_weight_parentheses=STRING — sets the characters enclosing the first weight of a printed composite weight (think pair weight, tuple weight, and derived classes) so nested composite weights get proper I/O. it MUST have size 0 (none) or 2 (open and close parenthesis). Default: no parentheses.
• --fst_weight_separator=CHARACTER — sets the character separator between printed composite weights. Default: comma.
• --help[=BOOLEAN] — shows usage information. Default: false.
• --helpshort[=BOOLEAN] — shows brief usage information. Default: false.
• --save_relabel_ipairs=FILENAME — saves input relabel pairs to a file. Default: do not save.
• --save_relabel_opairs=FILENAME — saves output relabel pairs to a file. Default: do not save.
• --tmpdir=PATHNAME — sets the temporary directory to use. Default: /tmp.
• --v[=N] — sets the verbosity level. Default: 0.

---

🌈 SEE ALSO 🌈

the whole friend group, fr fr — go say hi to all of them 💜

• fstarcsort(1), fstclosure(1), fstcompile(1), fstcompose(1), fstcompress(1), fstconcat(1), fstconnect(1), fstconvert(1), fstdeterminize(1), fstdifference(1), fstdisambiguate(1), fstdraw(1), fstencode(1), fstepsnormalize(1), fstequal(1), fstequivalent(1), fstinfo(1), fstinvert(1), fstisomorphic(1), fstlinear(1), fstloglinearapply(1), fstmap(1), fstminimize(1), fstprint(1), fstproject(1), fstprune(1), fstpush(1), fstrandgen(1), fstrelabel(1), fstreplace(1), fstreverse(1), fstreweight(1), fstrmepsilon(1), fstshortestdistance(1), fstshortestpath(1), fstsymbols(1), fstsynchronize(1), fsttopsort(1), fstunion(1)

---

ok that's the whole page bestie, you ate that 💅✨ this one's rocking OpenFst 1.8.5 and it came out Mar 2026, mwah 🎀 go intersect something iconic 🦋👑