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Full Discussion: "Phantom" overwrite with dd on sda*?
Top Forums UNIX for Advanced & Expert Users "Phantom" overwrite with dd on sda*? Post 302921523 by Don Cragun on Friday 17th of October 2014 08:06:15 PM
Old 10-17-2014
It is doing exactly what you told it to do: create a regular file with the literal name /dev/sda* and write zero bytes to that file until the fiesystem containing the /dev directory is out of space.

Shell pathname pattern matching doesn't apply here unless you have a directory in the directory where you run this command with the name of= that contains a directory named dev that contains one or more files that match the pattern sda*. And, if there was more than one file matching that pattern, you would be giving dd two or more of=pathname operands, and that would produce unspecified behavior.

The dd utility can only process one output file per invocation.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT DEBIAN

ppi::token::magic

PPI::Token::Magic(3pm)					User Contributed Perl Documentation				    PPI::Token::Magic(3pm)

NAME

       PPI::Token::Magic - Tokens representing magic variables

INHERITANCE

	 PPI::Token::Magic
	 isa PPI::Token::Symbol
	     isa PPI::Token
		 isa PPI::Element

SYNOPSIS

	 # When we say magic variables, we mean these...
	 $1   $2   $3	$4   $5   $6   $7   $8	 $9
	 $_   $&   $`	$'   $+   @+   %+   $*	 $.    $/    $|
	 $\  $"   $;	$%   $=   $-   @-   %-	 $)    $#
	 $~   $^   $:	$?   $!   %!   $@   $$	 $<    $>
	 $(   $0   $[	$]   @_   @*   $}   $,	 $#+   $#-
	 $^L  $^A  $^E	$^C  $^D  $^F  $^H
	 $^I  $^M  $^N	$^O  $^P  $^R  $^S
	 $^T  $^V  $^W	$^X

DESCRIPTION

       "PPI::Token::Magic" is a sub-class of PPI::Token::Symbol which identifies the token as "magic variable", one of the strange and unusual
       variables that are connected to "things" behind the scenes.

       Some are extremely common, like $_, and others you will quite probably never encounter in your Perl career.

METHODS

       The class provides no additional methods, beyond those provided by it's PPI::Token::Symbol, PPI::Token and PPI::Element.

SUPPORT

       See the support section in the main module.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2001 - 2011 Adam Kennedy.

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

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.10.1							    2011-02-26						    PPI::Token::Magic(3pm)
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