use the -s operator to determine the file's size, and set the $/ special variable to equal 1/4th of the size returned by -s. Then read in a while() loop, just like you always would.
See perlvar for an explanation of how to set $/, and perlfunc -X to learn about -s
...or, again use -s, and then seek to specific locations and use sysread with a length of 1/4th of the total. But then beware of off-by-one errors.
Of course with any of these methods, you're going to run into some memory constraints; reading 25% of a 10GB file will consume 2.5GB. Might be better to set $/ to 1/16th of the file size, and then read/write four times for each output file.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||