Linux Bash Sed 的使用
文本文件内容 a.txt。
this is a dog this is a dog this is a dog this is a cat this is a cat this is a cat this is a dog
sed 按照行替换，将第 2，3 行的 dog 替换为 cat：
$ sed '2,3s/dog/cat/' a.txt this is a dog this is a cat this is a cat this is a cat this is a cat this is a cat this is a dog
按照正则条件进行替换，将含有 dog 一行的 this 替换为 that：
$ sed '/dog/s/this/that/' a.txt that is a dog that is a dog that is a dog this is a cat this is a cat this is a cat that is a dog