Filter the output of a file continously using tail and grep

tail -f $FILENAME | grep --line-buffered $PATTERN
The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

2019-05-30 21:01:59

1 Alternatives + Submit Alt

What Others Think

Using this simple command, one can continuously filter the output of the file utilizing only grep and tail. I am so thankful to you for creating this remarkable command for us. Other than your source, I have taken some additional help from the article to improve the learning experience of my students. Hopefully, my students would be able to easily remember it.
HayleyRice · 68 weeks and 6 days ago
Are you also one of the students who is searching for the best essay writing service which can provide professional services at cost-effective means. I can suggest this trustworthy website. You can use this link and read the reviews of the website which I am telling you. If you find it suitable you can choose to opt for the same.
ChelseaSCripe · 36 weeks and 5 days ago
Good suggestion couples counseling near me
geebranz · 36 weeks and 3 days ago
Hello guys i am ready play this game and you
shabdydv27 · 32 weeks ago
Whittier Tree Service Company has a lot of files that need to be managed and organized. This will be helpful for them.
TylerCorona · 21 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: