Thursday, June 26, 2014

Re: Compare files, save differences


On Mon, Apr 21, 2014 at 5:14 AM, Jeri Raye <jeri.raye@gmail.com> wrote:
Hi,

I have a file allwords.txt.
And I have another file mywords.txt

How can I filter the differences, and safe them in another file called difwords.txt?

Example:
+------ allwords.txt -------+
James
Richard
Anna
Claude
Ben
+------------+

+------mywords.txt-----+
Anna
Ben
+-------------------+

This should then make the following file

+------difwords.txt-----+
James
Richard
Claude
+-----------+

It has been a long time since you posted this. I am not sure if you found the solution already. But since this is a problem I frequently encounter, I made a perl script to solve it. You can download it from https://sourceforge.net/p/rajuutils/code/ci/master/tree/perl/overlap/ . By default, it operates on two files setA.txt, setB.txt. The output is stored in "out" directory.

For example, with the following input files
rajulocal@hogwarts:~/work/rutils/perl/overlap$ cat setA.txt   James  Richard  Anna  Claude  Ben  rajulocal@hogwarts:~/work/rutils/perl/overlap$ cat setB.txt   Anna  Ben  Jeff  Raju  
Run the script

rajulocal@hogwarts:~/work/rutils/perl/overlap$ ./overlap.pl 
set           count pct
A             5 0.71
B             4 0.57
A or B         7 1.00
A and B       2 0.29
A - B         3 0.43
B - A         2 0.29
notA and notB 0 0.00
storing output files under out directory

The output files are as follows:
rajulocal@hogwarts:~/work/rutils/perl/overlap$ ls out/
out_AandB.txt  out_AorB.txt  out_notAnotB.txt  out_onlyA.txt  out_onlyB.txt

In this case, the file you are interested in is out_onlyA.txt

rajulocal@hogwarts:~/work/rutils/perl/overlap$ cat out/out_onlyA.txt 
Claude
James
Richard

hth
raju
-- 
Kamaraju S. Kusumanchi

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