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Joining lines in different way


 
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# 1  
Old 06-12-2013
Linux Joining lines in different way

Hi all,

I'm excited to the part of unix.com forum, and noob to it.

I have an query, where I have an file and it contains data like this
Code:
use 
thread
when
posting
do
no

I was expecting the result as
Code:
use thread
thread when
when posting
posting do
do no
use thread when
thread when posting
when posting do
posting do no

I have tried
Code:
cat demo.txt | xargs -n 2

but it gave result as
Code:
use thread
when posting
do no

but I was expecting the above result only. Any advice on how to achieve the result

Last edited by Franklin52; 06-12-2013 at 03:30 AM.. Reason: Please use code tags
# 2  
Old 06-12-2013
You are expecting that word are multiplying?

Post your real data and what is your goal, and how to come there.

Last edited by Jotne; 06-12-2013 at 03:02 AM..
# 3  
Old 06-12-2013
For combining 2 lines
Code:
$ perl -ne 'chomp; push @a, $_; if ($#a >= 1) {@a = @a[@a-2..$#a]; print "$a[0] $a[1]\n"}' join.txt 
use thread
thread when
when posting
posting do
do no

For combining 3 lines
Code:
$ perl -ne 'chomp; push @a, $_; if ($#a >= 2) {@a = @a[@a-3..$#a]; print "$a[0] $a[1] $a[2]\n"}' join.txt 
use thread when
thread when posting
when posting do
posting do no

# 4  
Old 06-12-2013
Code:
awk '{if(NR>1) print t,$0;t=$0}' join.txt
use thread
thread when
when posting
posting do
do no

# 5  
Old 06-12-2013
Thank you rajamahavan, perl has done magic.

@jotne. How to do the same for combining 3 lines... ?

Last edited by Jose Nirmal; 06-12-2013 at 03:36 AM.. Reason: Please use code tags
# 6  
Old 06-12-2013
3
Code:
awk '{if(NR>2) print s,t,$0;s=t;t=$0}' join.txt
use thread when
thread when posting
when posting do
posting do no

4
Code:
awk '{if(NR>3) print r,s,t,$0;r=s;s=t;t=$0}' join.txt
use thread when posting
thread when posting do
when posting do no

This User Gave Thanks to Jotne For This Post:
# 7  
Old 06-12-2013
Thank you. My first query has been solved.

I'm interested in knowing the explanation of awk and perl code. So that I can learn.........................

Last edited by Jose Nirmal; 06-12-2013 at 03:50 AM.. Reason: missed something

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