[33029] in Perl-Users-Digest
Perl-Users Digest, Issue: 4305 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Thu Oct 30 21:09:16 2014
Date: Thu, 30 Oct 2014 18:09:05 -0700 (PDT)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Thu, 30 Oct 2014 Volume: 11 Number: 4305
Today's topics:
Re: Comparing lines of strings between two files? <gravitalsun@hotmail.foo>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Fri, 31 Oct 2014 01:09:27 +0200
From: George Mpouras <gravitalsun@hotmail.foo>
Subject: Re: Comparing lines of strings between two files?
Message-Id: <m2ugf6$2l68$1@news.ntua.gr>
On 27/10/2014 9:40 πμ, Tuxedo wrote:
> Rainer Weikusat wrote:
>
> [...]
>
>>
>> comm -2 -3 <file #0> <file #1>
>
> As long as the files content has been sorted beforehand, comm seems to be
> the perfect utility for the purpose!
>
> Many thanks for the tip.
>
> Tuxeo
>
# quick, and probably faulty solution
#!/usr/bin/perl;
use strict; use warnings;
my ($file_left, $file_right) = ('left.txt', 'right.txt');
open 'left', '<', $file_left or die "Could not read file
\"$file_left\" because \"$!\"\n";
open 'right', '<', $file_right or die "Could not read file
\"$file_right\" because \"$!\"\n";
# left --> right
while (my $left = <left>)
{
chomp $left;
while (my $right = <right>)
{
chomp $right;
if ($left eq $right)
{
print "right $. == $right\n";
last
}
else
{
print "right line $. <- $right\n"
}
}
last if eof 'right';
}
close 'left'; close 'right';
open 'left', '<', $file_left or die "Could not read file
\"$file_left\" because \"$!\"\n";
open 'right', '<', $file_right or die "Could not read file
\"$file_right\" because \"$!\"\n";
# left <-- right
while (my $right = <right>)
{
chomp $right;
while (my $left = <left>)
{
chomp $left;
if ($left eq $right)
{
#print "$. == $left\n";
last
}
else
{
print "left line $. -> $left\n"
}
}
last if eof 'left';
}
close 'left'; close 'right';
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
Administrivia:
To submit articles to comp.lang.perl.announce, send your article to
clpa@perl.com.
Back issues are available via anonymous ftp from
ftp://cil-www.oce.orst.edu/pub/perl/old-digests.
#For other requests pertaining to the digest, send mail to
#perl-users-request@ruby.oce.orst.edu. Do not waste your time or mine
#sending perl questions to the -request address, I don't have time to
#answer them even if I did know the answer.
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End of Perl-Users Digest V11 Issue 4305
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