UNIX for Dummies Questions & Answers

hi all,

I would like to grep without duplication, what should I do,

say

I have file abc.txt

contains

Code:

n xyz jik
n xyz jik

I have another file def.txt

what command I should use in script to copy n xyz jik once from abc.txt to def.txt

right now I am using

Code:

grep -i "xyz" $abc >>$def

but it causes duplication

and thus the output is

Code:

n xyz jik
n xyz jik

I want it to be

Code:

n xyz jik

looking forward for the reply

Thank you in advance

Moderator's Comments:

Welcome to the UNIX and Linux Forums. Please use code tags. Video tutorial on how to use them

See if your requirement is print or store the unique value of 2nd Column (I assume delimiter is space) the below is your solution:

Code:

awk '!A[$2]++{print $0}' abc.txt > def.txt

try this

Code:

# grep -i -m 1 "xyz" $abc >>$def

Hi,
You can make use of the below command line for your expected output.

Sanjay.

---------- Post updated 04-19-12 at 12:32 PM ---------- Previous update was 04-18-12 at 04:21 PM ----------

Hi,

I am totally disagree for the query ygemici has posted.

Code:

grep -i -m 1 "xyz" $abc >>$def

above one is wrong one.

if the content of the file abc is like below.

Code:

n xyz jik
n xyz jik
a abc def
a abc def
c xyz nmp
n xyz nmp
k p r
k p r
k p r
t yy q
t yy q
t yy q
t yy q
t yy q

then it is only returning the first row of the xyz partened line. so it is totally worng .
now with a simple file content

Code:

t xyz rm
p xyz rm

and for above content if we will use Ygemici's command line .it gives

Code:

t xyz rm

which is aboutlutely worng.

thankx,
Sanjay.

Moderator's Comments:

Please use code tags, thanks!

@Sanjay, did you mean to phrase your post like that? A little more courteous choice of words would be appreciated, please read the rules, particularly rule #1 and #2, which you agreed to when you registered, if you have not already done so.

Thank You.

The UNIX and Linux Forums.

i think,you dont understand some things..
but i really want to help if you want to more learn.

regards,
ygemici

@Ygemici.

Every body in this world does not understand something (I am not an exception).
To err is human. But to accept the error is the real quality of a human.

Ok if you think your post is correct then ok I have nothing to say.

@forum

I am sorry to write like this but I could not stop when somebody wants to fight.

thanks & regards,
Sanjay.