.\" zerofill - clear unused disk space and blank devices. .\" Copyright (C) 2010-2014 David Sugar .\" Copyright (C) 2015 Cherokees of Idaho. .\" .\" This manual page is free software; you can redistribute it and/or modify .\" it under the terms of the GNU General Public License as published by .\" the Free Software Foundation; either version 3 of the License, or .\" (at your option) any later version. .\" .\" This program is distributed in the hope that it will be useful, .\" but WITHOUT ANY WARRANTY; without even the implied warranty of .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the .\" GNU General Public License for more details. .\" .\" You should have received a copy of the GNU Lesser General Public License .\" along with this program. If not, see . .\" .\" This manual page is written especially for Debian GNU/Linux. .\" .TH zerofill "1" "January 2010" "GNU uCommon" "GNU Telephony" .SH NAME zerofill \- clear unused disk space and blank devices. .SH SYNOPSIS .B zerofill .RI [ options ] .RI [ devices ] .I ... .br .SH DESCRIPTION This command is a relative of nullfile. Like nullfile, it can be used to write all unused disk space with '0', thereby making file systems that are stored on virtual machines easier to pack. In addition, zerofill can fill unused disk space with random data before zeroing, which can be useful to remove forensic trace of deleted files. Finally, zerofile can be told to operate on and zero (erase) complete disk devices. .SH OPTIONS .TP .BI \-\-random= count Number of passes to use writing random data before wiping data. .TP .B \-\-help Outputs help screen for the user. .SH AUTHOR .B zerofill was written by David Sugar . .SH "REPORTING BUGS" Report bugs to bug-commoncpp@gnu.org or bugs@gnutelephony.org. .SH COPYRIGHT Copyright \(co 2010-2014 David Sugar, Tycho Softworks. .br This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.