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Re: Split file into 4 smaller ones

by BrowserUk (Pope)
on Feb 08, 2013 at 00:42 UTC ( #1017738=note: print w/ replies, xml ) Need Help??

in reply to Split file into 4 smaller ones

This will create output files split1 through split4. They will vary slightly in size in order that each file contains complete lines. The memory usage is minimal:

#! perl -sw use strict; open I, '<', $ARGV[0] or die $!; seek I, 0, 2; my $n = int( tell( I ) / 4 ); seek I, 0, 0; my $s = $n; for my $i ( 1 .. 4 ) { open O, '>', "split$i" or die $!; while( tell( I ) < $s ) { print O scalar <I>; } $s += $n; close O; } __END__ C:\test>dir words.txt 17/07/2011 15:52 1,941,858 words.txt C:\test>split4 words.txt C:\test>dir split* 08/02/2013 00:41 485,470 split1 08/02/2013 00:41 485,458 split2 08/02/2013 00:41 485,468 split3 08/02/2013 00:41 485,462 split4 08/02/2013 00:38 298

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