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Re^2: use to files - grep one to eliminate entries from another file.

by Cristoforo (Curate)
on Jan 24, 2012 at 00:43 UTC ( #949558=note: print w/replies, xml ) Need Help??

in reply to Re: use to files - grep one to eliminate entries from another file.
in thread use to files - grep one to eliminate entries from another file.

By doing a 'Super Search', (located at the top of any PerlMonks page here), with the words 'find common lines', you will find similiar problems and solutions.

Only, they find lines in common rather than unique. But its not difficult to figure this the difference, I believe.

If the THIDS file isn't too large for your memory, you could read it into a hash to check against the 'mail.fil' for differences.

#!/usr/local/perl-5.12.3/bin/perl use strict; use warnings; open my $THIDS,"<", "THIDSerrs" or die "Could not open 'THIDSerrs' for + reading. $!"; my %data = map {$_ => 1} <$THIDS>; close $THIDS or die "Unable to close 'THIDSerrs' - reading. $!"; open my $mail, "<" , "mail.fil" or die "Could not open 'mail.fil' for +reading. $!"; open my $out, ">", "whatever.dat" or die "Unable to open 'whatever.dat +' for write. $!"; while (<$mail>) { print $out unless $data{$_}; } close $mail or die "Unable to close 'mail.fil' - reading. $!"; close $out or die "Unable to close 'whatever.dat' from writing. $!";
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Re^3: use to files - grep one to eliminate entries from another file.
by newkendall (Initiate) on Jan 24, 2012 at 01:04 UTC

    Thanks. I'll work on this tonight

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[ambrus]: Corion: two very hard things about presentations I should try to work on if I have twenty times as much free time as in real life are:
[Corion]: That's why I like HTML - it makes it relatively easy to resize stuff. Resizing with Powerpoint is much harder, or at least, I remember it being that way
[ambrus]: (a) good sans serif fonts optimized for slides in a projector with coverage of the symbols needed for mathematical formulas in a sans serif font matching the text font well, and
[ambrus]: (b) a good presentation system that lets the presenter quickly interactively edit the slides live during a presentation, to combine the advantages of blackboard and overhead slide styles in modern tech
[Corion]: Heh - in university, I cheated on (a) by doing blackboard presentations using chalk. But those were 2 hour presentations, not quick/essential/ reduced presentations where you want to show something quick
[ambrus]: (either on just one screen or two screens). this is necessary because
[ambrus]: overhead slide plus blackboard is inconvenient because the lighting conditions are different and they require separate areas you can't quickly repartition, and typing on keyboard is faster and more convenient than writing on a blackboard
[Corion]: (b) would be cool. I've thought about this doing Pod editing, and even simply regenerating/live updating the browser makes things much more interactive
[ambrus]: modern computers have way enough processing power to allow this, at least for geeks who are willing to spend a few weeks to learn a tricky new user interface like vim
[Corion]: ambrus: Well, for mathematical notation, I find blackboard much more convenient than a computer. But when inserting text or moving text around, the computer wins obviously

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