Question

I have a file in Linux, I would like to display lines which contain a specific string in that file, how to do this?

Answer 1

The usual way to do this is with grep, which uses a regex pattern to match lines:

grep 'pattern' file

Each line which matches the pattern will be output. If you want to search for fixed strings only, use grep -F 'pattern' file. fgrep is shorthand for grep -F.

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You can also use sed:

sed -n '/pattern/p' file

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Or awk:

awk '/pattern/' file