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Comparing two test files and printing out the values that do not match

 
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# 1  
Old 10-18-2012
Comparing two test files and printing out the values that do not match
Hi,

I have two text files with matching first columns. Some of the values in the second column do not match. I want to write a script to print out the rows (only the first column) where the values in the second column do not match.
Example:

Input 1
Code:
A 1 
B 2
C 3 
D 4

Input 2
Code:
A 2
B 2
C 3
D 1

Output
Code:
A
D

Thanks!
# 2  
Old 10-18-2012
Code:
paste file1 file2 | awk '$2 != $4{print $1}'

A
D

This User Gave Thanks to in2nix4life For This Post:
evelibertine
# 3  
Old 10-18-2012
Or

Code:
diff file1 file2 | awk '$1=="<" {print $2}'

# 4  
Old 11-04-2012
How can I modify the code if the files have 20 columns instead of 2 columns? The first column of the files still match perfectly. I want to print out the rows in which there is a perfect match between every single element between the two files?
# 5  
Old 11-04-2012
Hi

Code:
$ cat file1
A 1 a
B 2 b
C 3 c
D 4 d


Code:
$ cat file2
A 2 a
B 2 b
C 3 c
D 1 d

To find the lines with all matches:

Code:
$ comm -12 file1 file2
B 2 b
C 3 c

This User Gave Thanks to guruprasadpr For This Post:
evelibertine
# 6  
Old 11-04-2012
Thanks! What if I want to modify the script so that it prints out lines with at most 1 difference between file 1 and file 2 and so on?
# 7  
Old 11-04-2012
Hi
Please show us the script with what you have tried till now to get this done?

Guru.
 
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