#!/bin/bash
sed ‘{#remove empty line s/^M$// s/.$// /^$/d s/^!/#&/ :a s/^#\(.*\)/\1/ ta /^\[.*\]/ {N; s/\n/ /}}‘ input.txt
BASH:sed script
原文：https://www.cnblogs.com/xinyueliu/p/12615649.html
