Updated
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50
doc/tar.texi
50
doc/tar.texi
@@ -3934,13 +3934,10 @@ is the @samp{--update} operation; you can use this to add newer
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versions of archive members to an existing archive. To learn how to
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do this with @samp{--update}, @pxref{update}.)
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@FIXME{Explain in second paragraph whether you can get to the previous
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version -- explain whole situation somewhat more clearly.}
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If you use @value{op-append} to add a file that has the same name as an
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archive member to an archive containing that archive member, then the
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old member is not deleted. What does happen, however, is somewhat
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complex. @command{tar} @emph{allows} you to have infinite numbers of files
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complex. @command{tar} @emph{allows} you to have infinite number of files
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with the same name. Some operations treat these same-named members no
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differently than any other set of archive members: for example, if you
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view an archive with @value{op-list}, you will see all of those members
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@@ -3954,14 +3951,33 @@ other members would end up in the working directory. This is because
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in the archive; the most recently archived members will be extracted
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last. Additionally, an extracted member will @emph{replace} a file of
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the same name which existed in the directory already, and @command{tar}
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will not prompt you about this. Thus, only the most recently archived
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will not prompt you about this@footnote{Unless you give it
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@option{--keep-old-files} option, or the disk copy is newer than the
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the one in the archive and you invoke @command{tar} with
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@option{--keep-newer-files} option}. Thus, only the most recently archived
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member will end up being extracted, as it will replace the one
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extracted before it, and so on.
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@FIXME{ hag -- you might want to incorporate some of the above into the
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MMwtSN node; not sure. i didn't know how to make it simpler...}
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There exists a special option that allows you to get around this
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behavior and extract (or list) only a particular copy of the file.
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This is @option{--occurrence} option. If you run @command{tar} with
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this option, it will extract only the first copy of the file. You
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may also give this option an argument specifying the number of
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copy to be extracted. Thus, for example if the archive
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@file{archive.tar} contained three copies of file @file{myfile}, then
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the command
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There are a few ways to get around this. @FIXME-xref{Multiple Members
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@smallexample
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tar --extract --file archive.tar --occurrence=2 myfile
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@end smallexample
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@noindent
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would extract only the second copy. @xref{Option Summary,---occurrence}, for the description of @value{op-occurrence} option.
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@FIXME{ hag -- you might want to incorporate some of the above into the
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MMwtSN node; not sure. i didn't know how to make it simpler...
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There are a few ways to get around this. (maybe xref Multiple Members
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with the Same Name.}
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@cindex Members, replacing with other members
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@@ -4085,10 +4101,20 @@ The newest version of @file{blues} is now at the end of the archive
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(note the different creation dates and file sizes). If you extract
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the archive, the older version of the file @file{blues} will be
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replaced by the newer version. You can confirm this by extracting
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the archive and running @samp{ls} on the directory. @xref{Writing},
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for more information. (@emph{Please note:} This is the case unless
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you employ the @value{op-backup} option. @FIXME-ref{Multiple Members
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with the Same Name}.)
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the archive and running @samp{ls} on the directory.
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If you wish to extract the first occurrence of the file @file{blues}
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from the archive, use @value{op-occurrence} option, as shown in
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the following example:
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@smallexample
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$ @kbd{tar --extract -vv --occurrence --file=collection.tar blues}
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-rw-rw-rw- me user 21 1996-09-23 16:44 blues
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@end smallexample
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@xref{Writing}, for more information on @value{op-extract} and
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@xref{Option Summary, --occurrence}, for the description of
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@value{op-occurrence} option.
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@node update
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@subsection Updating an Archive
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