Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Notices
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
I have a large file and want to keep certain lines based on the first word in each. The words are blank-delimited character strings.
The first words are not necessarily unique.
I want to keep the uniques, and that's easy enough.
Where duplicates are encountered I want to keep only one
of each, and the kept line must be the *last* of the duplicates.
Sample input file:
ALBERT 54
BENJAMIN 37
BILL 24
BILL 25
BILL 77
CARL 40
CARL 44
CHESTER 59
DAVID 23
DAVID 23
DAVID 28
DAVID 61
EDGAR 33
EDWARD 54
EDWARD 59
EDWIN 30
Desired output file:
ALBERT 54
BENJAMIN 37
BILL 77
CARL 44
CHESTER 59
DAVID 61
EDGAR 33
EDWARD 59
EDWIN 30
I'm a newbie and still learning the basics, so please:
- no awk
- no bash
- no Perl
Let's stick to commands such as uniq, sort, sed, grep, cut, paste, etc.
I have a large file and want to keep certain lines based on the first word in each. The words are blank-delimited character strings.
The first words are not necessarily unique.
I want to keep the uniques, and that's easy enough.
Where duplicates are encountered I want to keep only one
of each, and the kept line must be the *last* of the duplicates.
Sample input file:
ALBERT 54
BENJAMIN 37
BILL 24
BILL 25
BILL 77
CARL 40
CARL 44
CHESTER 59
DAVID 23
DAVID 23
DAVID 28
DAVID 61
EDGAR 33
EDWARD 54
EDWARD 59
EDWIN 30
Desired output file:
ALBERT 54
BENJAMIN 37
BILL 77
CARL 44
CHESTER 59
DAVID 61
EDGAR 33
EDWARD 59
EDWIN 30
I'm a newbie and still learning the basics, so please:
- no awk
- no bash
- no Perl
Let's stick to commands such as uniq, sort, sed, grep, cut, paste, etc.
Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread is being closed because it is a duplicate.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.