Eliminate duplicate lines on a file

cat file1.txt | uniq > file2.txt

By: olafrv
2009-03-01 05:10:10

What Others Think

Wouldn't uniq file1.txt > file2.txt do the same?
cyrilrbt · 592 weeks and 3 days ago
Or simply do it like this: uniq file1.txt file2.txt
blindgaenger · 592 weeks and 3 days ago
Useless use of cat
H4rpy · 592 weeks and 2 days ago
It would be worth to mention, that it doesn't really remove all the duplicate lines. It only removes a line, if it is the same with the next line. To have only uniq lines in file, one can do: sort file1.txt | uniq > file2.txt
rain · 590 weeks and 4 days 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?

commandlinefu.com 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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

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: