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Full Discussion: Insert string in binary file at top
Top Forums UNIX for Advanced & Expert Users Insert string in binary file at top Post 302526307 by kumaran_5555 on Tuesday 31st of May 2011 06:15:00 AM
Old 05-31-2011
Code:
How can i append a EBCDIC string of 100 bytes to 0th position of a binary file in UNIX.

If you are attempting to insert 100 bytes at the end , then it isn't appedning at all. As far as I know, it the File system has to rearrange the blocks to accomadate the new 100 bytes.

So if you are inserting 100 bytes at the head of 60GB file, ideally i think the performance would be appending 60GB data onto a 100bytes file. I guess so.
 

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LEARN ABOUT MOJAVE

perlio::via::symlink

symlink(3)						User Contributed Perl Documentation						symlink(3)

NAME

       PerlIO::via::symlink - PerlIO layers for create symlinks

SYNOPSIS

	open $fh, '>:via(symlink)', $fname;
	print $fh "link foobar";
	close $fh;

DESCRIPTION

       The PerlIO layer "symlink" allows you to create a symbolic link by writing to the file handle.

       You need to write C"link $name" to the file handle. If the format does not match, "close" will fail with EINVAL.

TEST COVERAGE

	----------------------------------- ------ ------ ------ ------ ------ ------
	File				      stmt branch   cond    sub   time	total
	----------------------------------- ------ ------ ------ ------ ------ ------
	blib/lib/PerlIO/via/symlink.pm	     100.0  100.0    n/a  100.0  100.0	100.0
	Total				     100.0  100.0    n/a  100.0  100.0	100.0
	----------------------------------- ------ ------ ------ ------ ------ ------

AUTHORS

       Chia-liang Kao <clkao@clkao.org>

COPYRIGHT

       Copyright 2004-2005 by Chia-liang Kao <clkao@clkao.org>.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       See <http://www.perl.com/perl/misc/Artistic.html>

perl v5.18.2							    2005-03-01								symlink(3)
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