SED

两种执行方式
-n 禁止默认输出

sed [-n] [-e] 'command' file(s)
sed [-n] -f scriptfile file(s)

command结构

- [addr [,addr]] [!] action [arguments]
- [/pattern/[,/pattern/]] {
  cmd
  cmd
}

action

• a 拼接
• c 替换
• i 插入
• d 删除
• s 替换
• y 翻译
• p 打印

举例

# only print
sed -ne '/regexp/p' inputfile(s)
sed -n '/GREEN/,$p' inputfile(s)

# append after the pattern (-i 直接修改源文件)
sed -i '/pattern/a \
line1 \
line2' inputfile

# insert before the pattern
sed -i '/This is line two/i\your text 1\nyout text 2' inputfile(s)