Comparing the contents of two files

Hello Monks, I have to compare the contents of two files and the output should be a report which should give the text that is present in file1 and not in file2 and vice versa. Which logic can i use to implement the same??

File 1: "This is a site for perl questions.Really helpful!!!"

File 2: "This is a site where you get your perl queries cleared.Really helpful!!!"

The output should be:
"for perl questions." - present in file 1 but not in file 2

"where you get your perl queries cleared." - present in file 2 but not in file 1
How to achieve this???

Comment on Comparing the contents of two files
Re: Comparing the contents of two files by moritz (Cardinal) on Aug 02, 2011 at 12:58 UTC
I'd try to look on CPAN for solutions or partial solutions, like Algorithm::Diff or Text::WordDiff. Perl 6 - second systems done right	[reply]
Re: Comparing the contents of two files by derby (Monsignor) on Aug 02, 2011 at 14:27 UTC
Not a perl solution but I prefer to use sdiff for things like this. -derby	[reply]
Re: Comparing the contents of two files by JavaFan (Canon) on Aug 02, 2011 at 16:57 UTC
There's a standard POSIX utility that does that: `comm`. It assumes your files are sorted (but if not, that's easy to do). In bash, you can write: `comm <(sort file1) <(sort file2)` [download] and it prints three columns, one with lines only in file1, one with lines only in file2, and one with lines in both files.	[reply] [d/l]
Re: Comparing the contents of two files by onelesd (Pilgrim) on Aug 02, 2011 at 21:04 UTC
Your example shows differences on a single line, but your question asks about differences in a file. These will require different solutions, but maybe you are looking for a solution that handles both. Like another has suggested, I would look at POSIX's comm, and then perhaps run the results from that through String::Diff.	[reply]


Think about Loose Coupling
	PerlMonks

Comparing the contents of two files

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