---
name: "mmseg"
section: "1"
platform: "linux"
package: "sunpinyin"
version: "3.0.0rc2-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/mmseg"
---

# mmseg(1)

maximum matching segment Chinese text.

## NAME

mmseg - maximum matching segment Chinese text.

## SYNOPSIS

**mmseg** -d *dict\_file* \[*option*\]... \[*corpus\_file*\]...

## DESCRIPTION

**mmseg** is a tool for segmenting Chinese text into words using maximum matching algorithm. **mmseg** segments *corpus\_file*, or standard input if no filename is specified, and write the segmented result to standard output.

## OPTIONS

- **-d** *dict\_file*

  Use *dict\_file* as lexicon. A default lexicon can be found at */usr/share/sunpinyin-slm/dict.utf8*.

- **-f**,**--format** (**text**\|**bin**)

  Output Format, can be 'text' or 'bin'. default 'bin'. Normally, in text mode, word text are output, while in binary mode, binary short integer of the word-ids are written to stdout.

- **-s**, **--stok** *STOK\_ID*

  Sentence token id. Default 10. It will be written to output in binary mode after every sentence.

- **-i**, **--show-id**

  Show Id info. Under text output format mode, attach id after known words.  If under binary mode, print id(s) in text.

- **-a**, **--ambiguious-id** *AMBI-ID*

  Ambiguious means *ABC* =\> *A* *BC* or *AB* *C*. If specified (*AMBI-ID* != 0),  The sequence *ABC* will not be segmented, in binary mode, the *AMBI-ID* is written out; in text mode, `"<ambi>ABC</ambi>"` will be output. Default is 0.

## NOTES

Under **binary** mode, consecutive id of 0 are merged into one 0. Under **text** mode, no space are inserted between unknown-words.

## AUTHOR

Originally written by Phill.Zhang \<phill.zhang@sun.com\>. Currently maintained by Kov.Chai \<tchaikov@gmail.com\>.

## SEE ALSO

[**slmseg**(1)](/slmseg/1.md), **ids2ngram** (1).