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Display output by joining two files


 
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# 1  
Old 09-27-2013
Display output by joining two files

1.txt
Code:
A
B
C
D

2nd file:
2.txt
Code:
1
2
3
4

Output that I want to get:
Code:
A1
B2
C3
D4

How to get this output using awk command

Last edited by Scott; 09-27-2013 at 03:31 PM.. Reason: Code tags for code and data
# 2  
Old 09-27-2013
Why awk?

paste can do it easily:
Code:
$ paste -d"\0" file1 file2

This User Gave Thanks to Scott For This Post:
# 3  
Old 09-28-2013
Maybe he like to understand how array in awk works Smilie

Code:
awk 'FNR==NR {a[++f]=$0;next} {print a[FNR] $0}' 1.txt 2.txt
A1
B2
C3
D4

# 4  
Old 09-28-2013
paste would be the easiest solution, but using awk one could also:
Code:
awk 'getline $2<f' FS= OFS= f=file2 file1

# 5  
Old 09-28-2013
This was a new one for me, could you pleas explain this.
I see you add second file to a variable f, but does not get how the getline get next line in f
# 6  
Old 09-28-2013
Hi Jotne, it is reading a line from file1 and if it can also read a line from file2 and put it in a new $2, then the line gets printed, with $1 containing the line from file1 and $2 the line from file2, the blank field separators make sure there are only two fields...

On rereading I noticed however, that there can a problem with this, because some awk's have a special extension when FS is empty (every character is then split into fields, which is not a POSIX thing), so it should be:

Code:
awk 'getline $2<f' FS='\n' OFS= f=file2 file1


Last edited by Scrutinizer; 09-28-2013 at 06:36 AM..
These 3 Users Gave Thanks to Scrutinizer For This Post:

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