diff options
Diffstat (limited to 'source/a/zerofree/zerofree.sgml')
| -rw-r--r-- | source/a/zerofree/zerofree.sgml | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/source/a/zerofree/zerofree.sgml b/source/a/zerofree/zerofree.sgml new file mode 100644 index 00000000..af6e3a53 --- /dev/null +++ b/source/a/zerofree/zerofree.sgml @@ -0,0 +1,163 @@ +<!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN" [ + +<!-- Process this file with docbook-to-man to generate an nroff manual + page: `docbook-to-man manpage.sgml > manpage.1'. You may view + the manual page with: `docbook-to-man manpage.sgml | nroff -man | + less'. + --> + + <!ENTITY dhfirstname "<firstname>Thibaut</firstname>"> + <!ENTITY dhsurname "<surname>Paumard</surname>"> + <!-- Please adjust the date whenever revising the manpage. --> + <!ENTITY dhdate "<date>February 6, 2008</date>"> + <!ENTITY dhsection "<manvolnum>8</manvolnum>"> + <!ENTITY dhemail "<email><paumard@users.sourceforge.net></email>"> + <!ENTITY dhusername "Thibaut Paumard"> + <!ENTITY dhucpackage "<refentrytitle>ZEROFREE</refentrytitle>"> + <!ENTITY dhpackage "zerofree"> + + <!ENTITY debian "<productname>Debian</productname>"> + <!ENTITY gnu "<acronym>GNU</acronym>"> + <!ENTITY gpl "&gnu; <acronym>GPL</acronym>"> +]> + +<refentry> + <refentryinfo> + <address> + &dhemail; + </address> + <author> + &dhfirstname; + &dhsurname; + </author> + <copyright> + <year>2003</year> + <holder>&dhusername;</holder> + </copyright> + &dhdate; + </refentryinfo> + <refmeta> + &dhucpackage; + + &dhsection; + </refmeta> + <refnamediv> + <refname>&dhpackage;</refname> + + <refpurpose>zero free blocks from ext2/3/4 file-systems</refpurpose> + </refnamediv> + <refsynopsisdiv> + <cmdsynopsis> + <command>&dhpackage;</command> + + <arg><option>-n</option></arg> + + <arg><option>-v</option></arg> + + <arg choice=req><replaceable>filesystem</replaceable></arg> + </cmdsynopsis> + </refsynopsisdiv> + <refsect1> + <title>DESCRIPTION</title> + + <para><command>&dhpackage;</command> finds the unallocated, + non-zeroed blocks in an ext2, ext3, or ext4 + <replaceable>filesystem</replaceable> (e.g. /dev/hda1) and + fills them with zeroes. This is useful if the device on which + this file-system resides is a disk image. In this case, + depending on the type of disk image, a secondary utility may be + able to reduce the size of the disk image after zerofree has + been run.</para> + + <para>The usual way to achieve the same result (zeroing the + unallocated blocks) is to run <command>dd</command> (1) to + create a file full of zeroes that takes up the entire free + space on the drive, and then delete this file. This has many + disadvantages, which zerofree alleviates:</para> + <itemizedlist> + <listitem><para>it is slow;</para></listitem> + + <listitem><para>it makes the disk image (temporarily) grow to its maximal + extent;</para></listitem> + + <listitem><para>it (temporarily) uses all free space on the disk, so other + concurrent write actions may fail.</para></listitem> + + </itemizedlist> + + <para><replaceable>filesystem</replaceable> has to be unmounted or + mounted read-only for <command>&dhpackage;</command> to work. It + will exit with an error message if the + <replaceable>filesystem</replaceable> is mounted writable. To + remount the root file-system readonly, you can first switch to + single user runlevel (<command>telinit 1</command>) then use + <command>mount -o remount,ro + <replaceable>filesystem</replaceable></command>.</para> + + <para><command>&dhpackage;</command> has been written to be + run from GNU/Linux systems installed as guest OSes inside a + virtual machine. It may however be useful in other + situations.</para> + + </refsect1> + <refsect1> + <title>OPTIONS</title> + + <variablelist> + <varlistentry> + <term><option>-n</option> + </term> + <listitem> + <para>Perform a dry run (do not modify the file-system);</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>-v</option> + </term> + <listitem> + <para>Be verbose.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + <refsect1> + <title>SEE ALSO</title> + + <para>dd (1).</para> + + </refsect1> + <refsect1> + <title>AUTHOR</title> + + <para>This manual page was written by &dhusername; &dhemail; for + the &debian; system (but may be used by others). Permission is + granted to copy, distribute and/or modify this document under + the terms of the &gnu; General Public License, Version 2 or any + later version published by the Free Software Foundation. + </para> + <para> + On Debian systems, the complete text of the GNU General Public + License can be found in /usr/share/common-licenses/GPL-2. + </para> + + </refsect1> +</refentry> + +<!-- Keep this comment at the end of the file +Local variables: +mode: sgml +sgml-omittag:t +sgml-shorttag:t +sgml-minimize-attributes:nil +sgml-always-quote-attributes:t +sgml-indent-step:2 +sgml-indent-data:t +sgml-parent-document:nil +sgml-default-dtd-file:nil +sgml-exposed-tags:nil +sgml-local-catalogs:nil +sgml-local-ecat-files:nil +End: +--> + + |