want a visual indication that @command{tar} is still running, but
don't want to see @option{--verbose} output. You can also instruct
@command{tar} to execute a list of actions on each checkpoint, see
-@option{--checklist-action} below. For a detailed description, see
+@option{--checkpoint-action} below. For a detailed description, see
@ref{checkpoints}.
@opsummary{checkpoint-action}
When performing operations, @command{tar} will skip files that match
@var{pattern}. @xref{exclude}.
+@opsummary{exclude-backups}
+@item --exclude-backups
+Exclude backup and lock files. @xref{exclude,, exclude-backups}.
+
@opsummary{exclude-from}
@item --exclude-from=@var{file}
@itemx -X @var{file}
Exclude from dump any directory containing a valid cache directory
tag file, but still dump the directory node and the tag file itself.
-@xref{exclude}.
+@xref{exclude,, exclude-caches}.
@opsummary{exclude-caches-under}
@item --exclude-caches-under
@item --exclude-tag=@var{file}
Exclude from dump any directory containing file named @var{file}, but
-dump the directory node and @var{file} itself. @xref{exclude}.
+dump the directory node and @var{file} itself. @xref{exclude,, exclude-tag}.
@opsummary{exclude-tag-under}
@item --exclude-tag-under=@var{file}
Exclude from dump the contents of any directory containing file
-named @var{file}, but dump the directory node itself. @xref{exclude}.
+named @var{file}, but dump the directory node itself. @xref{exclude,,
+exclude-tag-under}.
@opsummary{exclude-tag-all}
@item --exclude-tag-all=@var{file}
Exclude from dump any directory containing file named @var{file}.
-@xref{exclude}.
+@xref{exclude,,exclude-tag-all}.
@opsummary{exclude-vcs}
@item --exclude-vcs
Exclude from dump directories and files, that are internal for some
widely used version control systems.
-@xref{exclude}.
+@xref{exclude,,exclude-vcs}.
@opsummary{file}
@item --file=@var{archive}
the permissions specified in the archive. This is the default behavior
for ordinary users.
+@opsummary{no-seek}
+@item --no-seek
+
+The archive media does not support seeks to arbitrary
+locations. Usually @command{tar} determines automatically whether
+the archive can be seeked or not. Use this option to disable this
+mechanism.
+
@opsummary{no-unquote}
@item --no-unquote
Treat all input file or member names literally, do not interpret
@opsummary{pax-option}
@item --pax-option=@var{keyword-list}
-This option is meaningful only with @acronym{POSIX.1-2001} archives
-(@pxref{posix}). It modifies the way @command{tar} handles the
+This option enables creation of the archive in @acronym{POSIX.1-2001}
+format (@pxref{posix}) and modifies the way @command{tar} handles the
extended header keywords. @var{Keyword-list} is a comma-separated
list of keyword options. @xref{PAX keywords}, for a detailed
discussion.
Assume that the archive media supports seeks to arbitrary
locations. Usually @command{tar} determines automatically whether
the archive can be seeked or not. This option is intended for use
-in cases when such recognition fails.
+in cases when such recognition fails. It takes effect only if the
+archive is open for reading (e.g. with @option{--list} or
+@option{--extract} options).
@opsummary{show-defaults}
@item --show-defaults
@vrindex TAR_ATIME, to-command environment
@item TAR_ATIME
Time of last access. It is a decimal number, representing seconds
-since the epoch. If the archive provides times with nanosecond
+since the Epoch. If the archive provides times with nanosecond
precision, the nanoseconds are appended to the timestamp after a
decimal point.
However, empty lines are OK.
+@table @option
@cindex version control system, excluding files
@cindex VCS, excluding files
@cindex SCCS, excluding files
@cindex Arch, excluding files
@cindex Mercurial, excluding files
@cindex Darcs, excluding files
-@table @option
@opindex exclude-vcs
@item --exclude-vcs
Exclude files and directories used by following version control
systems: @samp{CVS}, @samp{RCS}, @samp{SCCS}, @samp{SVN}, @samp{Arch},
@samp{Bazaar}, @samp{Mercurial}, and @samp{Darcs}.
-@end table
As of version @value{VERSION}, the following files are excluded:
@item @file{_darcs}
@end itemize
+@opindex exclude-backups
+@item --exclude-backups
+Exclude backup and lock files. This option causes exclusion of files
+that match the following shell globbing patterns:
+
+@table @asis
+@item .#*
+@item *~
+@item #*#
+@end table
+
+@end table
+
@findex exclude-caches
When creating an archive, the @option{--exclude-caches} option family
causes @command{tar} to exclude all directories that contain a @dfn{cache
%d/PaxHeaders.%p/%f
@end smallexample
+@item exthdr.mtime=@var{value}
+
+This keyword defines the value of the @samp{mtime} field that
+is written into the ustar header blocks for the extended headers.
+By default, the @samp{mtime} field is set to the modification time
+of the archive member described by that extended headers.
+
@item globexthdr.name=@var{string}
This keyword allows user control over the name that is written into
the ustar header blocks for global extended header records. The name
environment variable. If @var{TMPDIR} is not set, @command{tar}
uses @samp{/tmp}.
+@item exthdr.mtime=@var{value}
+
+This keyword defines the value of the @samp{mtime} field that
+is written into the ustar header blocks for the global extended headers.
+By default, the @samp{mtime} field is set to the time when
+@command{tar} was invoked.
+
@item @var{keyword}=@var{value}
When used with one of archive-creation commands, these keyword/value pairs
will be included at the beginning of the archive in a global extended
stored in the archive.
@end table
+In any of the forms described above, the @var{value} may be
+a string enclosed in curly braces. In that case, the string
+between the braces is understood either as a textual time
+representation, as described in @ref{Date input formats}, or a name of
+the existing file, starting with @samp{/} or @samp{.}. In the latter
+case, the modification time of that file is used.
+
+For example, to set all modification times to the current date, you
+use the following option:
+
+@smallexample
+--pax-option='mtime:=@{now@}'
+@end smallexample
+
+Note quoting of the option's argument.
+
+@cindex archives, binary equivalent
+@cindex binary equivalent archives, creating
+As another example, here is the option that ensures that any two
+archives created using it, will be binary equivalent if they have the
+same contents:
+
+@smallexample
+--pax-option=exthdr.name=%d/PaxHeaders/%f,atime:=0
+@end smallexample
+
@node Checksumming
@subsection Checksumming Problems
projects / chaz / tar / blobdiff