这是一款很好用的工具包

				#!/usr/local/bin/gawk -f				#				# reverse-text --				#	Reverse the word order in a text file				#				# $Header: /home/srilm/devel/utils/src/RCS/reverse-text.gawk,v 1.1 2003/01/01 18:35:23 stolcke Exp $				#				BEGIN {					start_tag = "";					end_tag = "";				}				{					if ($1 == start_tag) {						i = 2;					} else {						i = 1;					}									if ($NF == end_tag) {					    j = NF - 1;					} else {					    j = NF;					}									while (i < j) {						h = $i;						$i = $j;						$j = h; 						i ++; j--;					}					print;				}