How to grep for case insensitive string in a file?

Question

I have a file file1 which ends with Success... OR success...

I want to grep for the word success in

Answer 1

You can use the -i flag which makes your pattern case insensitive:

grep -iF "success..." file1

Also, there is no need for cat. grep takes a file with the syntax grep . I also used the -F flag to search for a fixed string to avoid escaping the ellipsis.