这是一款很好用的工具包

				#!/usr/local/bin/gawk -f				#				# filter a backoff model with a count file, so that only ngrams				# in the countfile are represented in the output				#				# usage: make-lm-subset count-file bo-file				#				# $Header: /home/srilm/devel/utils/src/RCS/make-lm-subset,v 1.3 1999/10/17 06:10:10 stolcke Exp $				#				ARGIND==1 {					ngram = $0;					sub("[ 	]*[0-9]*$", "", ngram);					count[ngram] = 1;					next;				}				ARGIND==2 && /^$/ {					print; next;				}				ARGIND==2 && /^\\/ {					print; next;				}				ARGIND==2 && /^ngram / {					print; next;				}				ARGIND==2 {					ngram = $0;					# strip numeric stuff					sub("^[-.e0-9]*[ 	]*", "", ngram);					sub("[ 	]*[-.e0-9]*$", "", ngram);					if (count[ngram]) print;					next;				}