CODEWITHSUNDEEP
bashcommand-line-interface
Ben Aston
Ben Aston

Reputation: 55769

Writing out only part of a log line

I want to tail a log, pipe it through grep to find the log entries I am interested in. This is straightforward:

tail -f logfile | grep foo

But how can I ensure only selected parts of each line are output? Ideally those parts matching a regex.

Upvotes: 1

Views: 70

Answers (1)

Mad Physicist
Mad Physicist

Reputation: 114478

You would use grep -o foo or grep --only-matching foo, where you would expand foo to include the entire part of the line that you wanted. The official GNU grep manual on this option is here.

Upvotes: 1

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