How do I grab a specific section of a stdout?

Question

I am trying to grab the sda# of a drive that was just inserted.

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

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

I would like to grab the sda1 part of the stdout, how would I do that?

score 2 · Accepted Answer · edited May 23 '17 at 12:25

2

I suggest to use this with GNU grep:

| 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.

edited May 23 '17 at 12:25

Community

answered Mar 12 '17 at 17:29

Cyrus

[Please vote if the answer was helpful.](http://stackoverflow.com/help/someone-answers) – Cyrus Mar 12 '17 at 17:46

1 Answers1