Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Using regular expressions with egrep and sed

We have now discussed both regular expressions and globbing. As we saw, they were very similar, but still had differences to be aware of. In our examples for regular expressions, and a little for globbing, we have already seen how grep can be used.

In this part, we'll introduce another command, which is very handy when combined with regular expressions: sed (not to be confused with set). We'll start with some advanced uses for grep.