使用vi编辑器在每X行插入新文本

Question

我目前有一个yaml文件(这个文件很大，格式如下)：

- created_at: 2021-01-18 15:11:44
  created_by: joe
  hostname: sfo
  ip: 1.1.1.1
  opersys: tmsh
  platform: f5
  role: lb
  type: loadbalancer
- created_at: 2021-01-18 15:11:44
  created_by: joe
  hostname: sjc
  ip: 2.2.2.2
  opersys: tmsh
  platform: f5
  role: lb
  type: loadbalancer

我想在每第8行插入一个新文本(serial_num: xxxxx)，这样看起来就像这样：

- created_at: 2021-01-18 15:11:44
  created_by: joe
  hostname: sfo
  ip: 1.1.1.1
  opersys: tmsh
  platform: f5
  role: lb
  type: loadbalancer
  serial_num: xxxxx
- created_at: 2021-01-18 15:11:44
  created_by: joe
  hostname: sjc
  ip: 2.2.2.2
  opersys: tmsh
  platform: f5
  role: lb
  type: loadbalancer
  serial_num: xxxxx

Answer 1

纯Vim，使用:help :global和:help :put

" after every line matching 'type:'
:g/type:/put='  serial_num: xxxxx'

" before every line matching 'type:'
:g/type:/put!='  serial_num: xxxxx'

纯Vim，使用:help :global和:help :normal

" after every line matching 'type:'
:g/type:/normal oserial_num: xxxxx

" before every line matching 'type:'
:g/type:/normal Oserial_num: xxxxx

Answer 2

使用GNU Sed

sed '/type: /a\  serial_num: xxxxx' your_file