list the identical words from fiel [closed]

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.

Stone · Accepted Answer · 2012-07-18 07:00:25Z

up vote 0 down vote accepted

Use sort, and uniq like this:

 cat list.txt | sort | uniq

answered Jul 18 '12 at 7:00

Stone
3,529220

1

You don't need cat. sort list.txt | uniq works. – Iain♦ Jul 18 '12 at 7:05

2

Gratuitous use of cat is gratuitous. – womble Jul 18 '12 at 7:14

You are right. My mistake. – Stone Jul 18 '12 at 8:04

quanta · Answer 2 · 2012-08-03 10:04:04Z

up vote 0 down vote

sort also has the --unique option:

$ sort -u list.txt

answered Aug 3 '12 at 10:04

quanta
26k22681

closed as off topic by womble, Shane Madden, voretaq7♦ Nov 14 '12 at 2:43