What do we grep for in each of the following commands?:

grep '[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}' some_file
- grep -E "error|failure" some_file
- grep '[0-9]$' some_file

Difficulty: unrated

Source: bregman-arie/devops-exercises by Arie Bregman

Answer

An IP address
The word "error" or "failure"
Lines which end with a number