list the identical words from fiel

Question

how can I list the identical words from below file using shell script ?

list.txt

LT
R
LT
MRTD
LT
MK
RR
RR

example result :

LT
R
MRTD
MK
RR

Your example result doesn't make sense R,MRTD and MK aren't duplicated ? Your Example result shows the unique 'words'. Please clarify your requirements. — user9517, Jul 18 '12 at 07:04

score 0 · Accepted Answer · answered Jul 18 '12 at 07:00

0

Use sort, and uniq like this:

 cat list.txt | sort | uniq

answered Jul 18 '12 at 07:00

Stone

1

You don't need cat. `sort list.txt | uniq` works. – user9517 Jul 18 '12 at 07:05
2

Gratuitous use of `cat` is gratuitous. – womble Jul 18 '12 at 07:14
You are right. My mistake. – Stone Jul 18 '12 at 08:04

score 0 · Answer 2 · answered Aug 03 '12 at 10:04

0

sort also has the --unique option:

$ sort -u list.txt

answered Aug 03 '12 at 10:04

quanta

2 Answers2