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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<META http-equiv="Content-Type" content="text/html; charset=Windows-1252">
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<TITLE>-u (Update options) switch</TITLE>
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<LINK href="style.css" rel="stylesheet" type="text/css">
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<H1>-u (Update options) switch</H1>
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<P>Specifies how to update files in an archive and (or) how to create new archives.</P>
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-u<A class="parameter" href="#disable_base_archive">[-]</A><action_set><A class="parameter" href="#new_archive_name">[!{new_archive_name}]</A>
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<action_set> ::= <state_action>...
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<state_action> ::= <A class="parameter" href="#state"><state></A><A class="parameter" href="#state"><action></A>
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<A class="parameter" href="#action"><state></A> ::= p | q | r | x | y | z | w
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<A class="parameter" href="#action"><action></A> ::= 0 | 1 | 2 | 3
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<DT><A name="disable_base_archive"></A>dash (-)</DT>
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<DD><P>Disables any updates in the base archive.</P>
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<P>The term <B>base archive</B> means the archive assigned by "base_archive_name"
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on the command line. See <A href="../syntax.htm">Command line syntax</A>
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<DT><A name="new_archive_name"></A>{new_archive_name}</DT>
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<DD><P>Specifies the path name of the new archive to be created.
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All options in this switch will refer to this new archive.</P>
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<P>If not assigned, then all options in this switch will
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refer to the base archive of the command.</P>
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<DT><A name="state"></A><state></DT>
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<DD><P>Specifies the state of a particular file to be processed.</P>
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<PRE class="syntax"><state> ::= p | q | r | x | y | z | w</PRE>
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<P>For each unique filename there are 6 variants of state:</P>
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<TR> <TH><state></TH> <TH>State condition</TH>
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<TH width="20%">File on Disk</TH> <TH width="20%">File in Archive</TH> </TR>
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<TR> <TD align="center">p</TD> <TD>File exists in archive, but is not matched with wildcard.</TD>
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<TD> </TD> <TD>Exists, but is not matched</TD> </TR>
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<TR> <TD align="center">q</TD> <TD>File exists in archive, but doesn't exist on disk.</TD>
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<TD>Doesn't exist</TD> <TD>Exists</TD> </TR>
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<TR> <TD align="center">r</TD> <TD>File doesn't exist in archive, but exists on disk.</TD>
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<TD>Exists</TD> <TD>Doesn't exist</TD> </TR>
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<TR> <TD align="center">x</TD> <TD>File in archive is newer than the file on disk.</TD>
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<TD>Older</TD> <TD>Newer</TD> </TR>
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<TR> <TD align="center">y</TD> <TD>File in archive is older than the file on disk.</TD>
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<TD>Newer</TD> <TD>Older</TD> </TR>
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<TR> <TD align="center">z</TD> <TD>File in archive is same as the file on disk</TD>
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<TD>Same</TD> <TD>Same</TD> </TR>
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<TR> <TD align="center">w</TD> <TD>Can not be detected what file is newer
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(times are the same, sizes are different)</TD>
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<TD>?</TD> <TD>?</TD> </TR>
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<DT><A name="action"></A><action></DT>
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<DD><P>Specifies the action for a given <A class="parameter" href="#state"><state></A>.</P>
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<PRE class="syntax"><action> ::= 0 | 1 | 2 | 3</PRE>
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<P>For each state you can specify one of the three variants of actions:</P>
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<TR> <TH><action></TH> <TH>Description</TH></TR>
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<TR> <TD align="center">0</TD> <TD>Ignore file (don't create item in new archive for this file)</TD></TR>
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<TR> <TD align="center">1</TD> <TD>Copy file (copy from old archive to new)</TD></TR>
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<TR> <TD align="center">2</TD> <TD>Compress (compress file from disk to new archive)</TD></TR>
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<TR> <TD align="center">3</TD> <TD>Create Anti-item (item that will delete file or directory during extracting). This feature is supported only in 7z format.</TD></TR>
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<P>Any update command (such as <A href="../commands/add.htm">a (Add)</A>,
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<A href="../commands/delete.htm">d (Delete)</A>,
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<A href="../commands/update.htm">u (Update)</A>) can be assigned in these terms.</P>
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<P>The following table shows action sets for update commands.</P>
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<TR> <TH>command \ <A class="parameter" href="#state"><state></A></TH>
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<TH>p</TH> <TH>q</TH> <TH>r</TH> <TH>x</TH> <TH>y</TH> <TH>z</TH> <TH>w</TH></TR>
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<TR> <TH><A href="../commands/delete.htm">d (Delete)</A></TH> <TD>1</TD> <TD>0</TD> <TD>0</TD> <TD>0</TD> <TD>0</TD> <TD>0</TD> <TD>0</TD></TR>
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<TR> <TH><A href="../commands/add.htm">a (Add)</A></TH> <TD>1</TD> <TD>1</TD> <TD>2</TD> <TD>2</TD> <TD>2</TD> <TD>2</TD> <TD>2</TD></TR>
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<TR> <TH><A href="../commands/update.htm">u (Update)</A></TH> <TD>1</TD> <TD>1</TD> <TD>2</TD> <TD>1</TD> <TD>2</TD> <TD>1</TD> <TD>2</TD></TR>
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<TR> <TH><A href="../commands/update.htm">Freshen</A></TH> <TD>1</TD> <TD>1</TD> <TD>0</TD> <TD>1</TD> <TD>2</TD> <TD>1</TD> <TD>2</TD></TR>
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<TR> <TH><A href="../commands/update.htm">Synchronize</A></TH> <TD>1</TD> <TD>0</TD> <TD>2</TD> <TD>1</TD> <TD>2</TD> <TD>1</TD> <TD>2</TD></TR>
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<P>If you don't specify a
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<A class="parameter" href="#new_archive_name"><I>!{new_archive_name}</I></A> option, then
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all options will refer to the main archive (the archive assigned on the command line after the 7z command).
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If you specify <A class="parameter" href="#new_archive_name"><I>!{new_archive_name}</I></A>
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option, then 7-Zip also will create a new archive with the specified name and all options
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will refer to that new archive.</P>
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<P>Multiple update switches are supported.
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7-Zip can create any number of new archives during one operation.</P>
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<P>By default, the action set for each new archive is assigned
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as the action set of the main command. There are 3 different
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action sets for commands: <A href="../commands/add.htm">a (Add)</A>,
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<A href="../commands/delete.htm">d (Delete)</A>,
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<A href="../commands/update.htm">u (Update)</A>.
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You can overload any <state_action> pair.</P>
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<H4>Time zone notes</H4>
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<P>If you change time zone (when you move your computer to another time zone
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or if there are clock changes for daylight saving in your zone), you can have some problems
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with update commands that depend from file's modification time. It's strongly recommended to use only
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file system that uses Coordinated Universal Time (UTC) and archive format that also uses UTC.
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In that case you will have no problems with time zone changes.
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Also it's recommended to use only UTC formats in other cases, for example, if you send files to
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someone in another time zone.</P>
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<P>Also in some cases there are no problems, if both file system and archive format use local time, for example, FAT file system and ZIP format.</P>
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<LI>UTC file systems: NTFS
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<LI>UTC archive formats: .zip with -mtc switch, 7z, tar, gzip2, iso, wim
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<LI>Local time file systems : FAT, FAT32
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<LI>Local time archive formats : rar, zip, cab
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<PRE class="example">
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7z u c:\1\exist.7z -u- -up0q3x2z0!c:\1\update.7z *
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<P>creates a new archive <SPAN class="filename">update.7z</SPAN> and
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writes to this archive all files from current directory which differ from
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files in <SPAN class="filename">exist.7z</SPAN> archive.
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<SPAN class="filename">exist.7z</SPAN> archive will not be changed.</P>
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<PRE class="example">
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7z u c:\1\exist.7z -up0q3x2z0!c:\1\update.7z * -ms=off
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<P>creates a new archive <SPAN class="filename">update.7z</SPAN> and
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writes to this archive all files from the current directory which differ from
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files in <SPAN class="filename">exist.7z</SPAN> archive.
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<P>Note: The current version of 7-Zip cannot change an archive created with the solid option switched on.
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To update a .7z archive, you must create and update the archive in non-solid
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mode (-ms=off switch).</P>
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<H4>Commands that can be used with this switch</H4>
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<A href="../commands/add.htm">a (Add)</A>,
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<A href="../commands/delete.htm">d (Delete)</A>,
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<A href="../commands/update.htm">u (Update)</A>,
added
removed
GUI/help/cmdline/switches/update.htm
