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Re: Using +> for File Read/Write

by pg (Canon)
on Nov 01, 2005 at 21:24 UTC ( #504746=note: print w/replies, xml ) Need Help??


in reply to Using +> for File Read/Write

A quick demo:

use Fcntl 'SEEK_CUR'; use strict; use warnings; open FILE, ">chars"; for (0 .. 25) { print FILE chr(ord('a') + $_); } close FILE; system("type chars"); print "\n"; open(FILE,"+<chars"); while (1) { sysread(FILE, my $chr, 1); last if (!ord($chr)); sysseek(FILE, -1, SEEK_CUR); syswrite(FILE, chr(ord($chr) - ord('a') + ord('A'))); } close FILE; system("type chars");

This prints:

abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ

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