Learn Linux Shell Scripting - Fundamentals of Bash 4.4

grep

We are going to dive right in as follows:

reader@ubuntu:~/scripts/chapter_10$ vim grep-file.txtreader@ubuntu:~/scripts/chapter_10$ cat grep-file.txt We can use this regular file for testing grep.Regular expressions are pretty coolDid you ever realise that in the UK they say colour,but in the USA they use color (and realize)!Also, New Zealand is pretty far away.reader@ubuntu:~/scripts/chapter_10$ grep 'cool' grep-file.txt Regular expressions are pretty coolreader@ubuntu:~/scripts/chapter_10$ cat grep-file.txt | grep 'USA'but in the USA they use color (and realize)!

First of all, let's explore the basic functionality of grep, before we move on to regular expressions. What grep does is really simple, as stated in man grep: print lines matching ...