如何获取标准输出的特定部分？

Question

我正在尝试抓取刚刚插入的驱动器的sda#。

tail -f /var/log/messages | grep sda:

返回：Mar 12 17:21:55 raspberrypi kernel: [ 1133.736632] sda: sda1

我想抓住标准输出的sda1部分，我该怎么做？

Answer 1

我建议在GNU grep中使用它：

| grep -Po 'sd[a-z]+: \Ksd[a-z0-9]+$'

  

\ K：This sequence resets the starting point of the reported match. Any previously matched characters are not included in the final matched sequence.

请参阅：The Stack Overflow Regular Expressions FAQ