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Re: Help needed in reading a very large file line by line

by trizen (Hermit)
on Feb 28, 2012 at 15:06 UTC ( #956682=note: print w/replies, xml ) Need Help??


in reply to Help needed in reading a very large file line by line

For very long lines, you can try something like this:
open my $fh, '<', $filename; my $line = ''; my $track = 0; my $max_line_length = 1024; # or whatever while (defined(my $char = getc $fh)) { $line .= $char; if (++$track == $max_line_length or $char eq "\n") { print $line; $line = ''; $track = 0; } } close $fh;

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[ambrus]: ad code examples.
[ambrus]: I'm not trying to recommend PHP, but I think it has way too bad a name because of its past.
[ambrus]: This is different from MS Word, which was already a good editor in the pre-unicode days (in word for windows versions 2 and 6, which ran on windows 3 but also on windows 95), only it wasn't trying to solve the task of writing maths papers back then.
[Discipulus]: ah ok, sounds reasonable; with no fear: Perl all life long
[ambrus]: Mind you, LaTeX is currently still useful for writing math paper or snippet content without styling in such a way that the
[ambrus]: formatting conventions of a journal or website can be quickly applied to it, and MS Office and LibreOffice has not quite solved this (although it's better for this than it used to be),
[ambrus]: which is sort of a drawback compared to the ages of typewritten manuscripts representing content only to which the typesetter applies formatting, but that process required much more manual labor.
[ambrus]: If you want to typeset a manuscript, you can still do much less work then in the manual typesetting ages and get good formatting.
[ambrus]: All with only cheap modern computers and software.
[ambrus]: Something you can have at home and your corner print shop, without a whole printing press's worth of equipment.

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