This is tar.info, produced by makeinfo version 4.13 from tar.texi.
-This manual is for GNU `tar' (version 1.24, 24 October 2010), which
+This manual is for GNU `tar' (version 1.25, 5 November 2010), which
creates and extracts files from archives.
Copyright (C) 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2003,
Makefiles. This practice will change in the future, in the
meantime, however this means that projects containing file names
more than 99 characters long will not be able to use GNU `tar'
- 1.24 and Automake prior to 1.9.
+ 1.25 and Automake prior to 1.9.
ustar
Archive format defined by POSIX.1-1988 specification. It stores
archive name suffix to determine its format (*note auto-compress::, for
a list of recognized suffixes).
+ Some compression programs are able to handle different compression
+formats. GNU `tar' uses this, if the principal decompressor for the
+given format is not available. For example, if `compress' is not
+installed, `tar' will try to use `gzip'. As of version 1.25 the
+following alternatives are tried(2):
+
+Format Main decompressor Alternatives
+---------------------------------------------------------------------
+compress compress gzip
+lzma lzma xz
+bzip2 bzip2 lbzip2
+
The only case when you have to specify a decompression option while
reading the archive is when reading from a pipe or from a tape drive
that does not support random access. However, in this case GNU `tar'
(1) It also had patent problems in the past.
+ (2) To verbosely trace the decompressor selection, use the
+`--warning=decompress-program' option (*note decompress-program:
+warnings.).
+
\1f
File: tar.info, Node: lbzip2, Up: gzip
******************
This appendix lists some important user-visible changes between version
-GNU `tar' 1.24 and previous versions. An up-to-date version of this
+GNU `tar' 1.25 and previous versions. An up-to-date version of this
document is available at the GNU `tar' documentation page
(http://www.gnu.org/software/tar/manual/changes.html).
file system at the time of the dump and is used to determine which
files were modified since the last backup.
- GNU `tar' version 1.24 supports three snapshot file formats. The
+ GNU `tar' version 1.25 supports three snapshot file formats. The
first format, called "format 0", is the one used by GNU `tar' versions
up to 1.15.1. The second format, called "format 1" is an extended
version of this format, that contains more metadata and allows for
further extensions. It was used by version 1.15.1. Starting from
-version 1.16 and up to 1.24, the "format 2" is used.
+version 1.16 and up to 1.25, the "format 2" is used.
GNU `tar' is able to read all three formats, but will create
snapshots only in format 2.
2. `Format 2' snapshot file begins with a format identifier, as
described for version 1, e.g.:
- GNU tar-1.24-2
+ GNU tar-1.25-2
This line is followed by newline. Rest of file consists of
records, separated by null (ASCII 0) characters. Thus, in contrast
* append, summary: Operation Summary. (line 6)
* atime-preserve: Attributes. (line 10)
* atime-preserve, summary: Option Summary. (line 19)
-* auto-compress: gzip. (line 144)
+* auto-compress: gzip. (line 156)
* auto-compress, summary: Option Summary. (line 65)
* backup: backup. (line 41)
* backup, summary: Option Summary. (line 71)
* checkpoint-action, summary: Option Summary. (line 105)
* compare: compare. (line 6)
* compare, summary: Operation Summary. (line 14)
-* compress: gzip. (line 101)
+* compress: gzip. (line 113)
* compress, summary: Option Summary. (line 152)
* concatenate: concatenate. (line 6)
* concatenate, summary: Operation Summary. (line 20)
* group: override. (line 75)
* group, summary: Option Summary. (line 289)
* gunzip, summary: Option Summary. (line 297)
-* gzip: gzip. (line 79)
+* gzip: gzip. (line 91)
* gzip, summary: Option Summary. (line 297)
* hard-dereference, described: hard links. (line 59)
* hard-dereference, summary: Option Summary. (line 305)
* listed-incremental, using with --extract: Incremental Dumps.
(line 121)
* listed-incremental, using with --list: Incremental Dumps. (line 186)
-* lzip: gzip. (line 92)
+* lzip: gzip. (line 104)
* lzip, summary: Option Summary. (line 392)
-* lzma: gzip. (line 95)
+* lzma: gzip. (line 107)
* lzma, summary: Option Summary. (line 396)
-* lzop: gzip. (line 98)
+* lzop: gzip. (line 110)
* mode: override. (line 14)
* mode, summary: Option Summary. (line 404)
* mtime: override. (line 29)
* touch, summary: Option Summary. (line 757)
* transform: transform. (line 74)
* transform, summary: Option Summary. (line 763)
-* uncompress: gzip. (line 101)
+* uncompress: gzip. (line 113)
* uncompress, summary: Option Summary. (line 152)
-* ungzip: gzip. (line 79)
+* ungzip: gzip. (line 91)
* ungzip, summary: Option Summary. (line 297)
* unlink-first: Unlink First. (line 6)
* unlink-first, introduced: Dealing with Old Files.
* update: update. (line 6)
* update, summary: Operation Summary. (line 50)
* usage: help. (line 54)
-* use-compress-program: gzip. (line 166)
+* use-compress-program: gzip. (line 178)
* use-compress-program, summary: Option Summary. (line 793)
* utc, summary: Option Summary. (line 798)
* verbose: verbose. (line 18)
* wildcards-match-slash, summary: Option Summary. (line 833)
* xform: transform. (line 74)
* xform, summary: Option Summary. (line 763)
-* xz: gzip. (line 84)
+* xz: gzip. (line 96)
* xz, summary: Option Summary. (line 836)
\1f
* Menu:
* %s: Directory has been renamed from %s, warning message: warnings.
- (line 94)
-* %s: Directory has been renamed, warning message: warnings. (line 94)
-* %s: Directory is new, warning message: warnings. (line 96)
+ (line 108)
+* %s: Directory has been renamed, warning message: warnings. (line 108)
+* %s: Directory is new, warning message: warnings. (line 110)
* %s: directory is on a different device: not purging, warning message: warnings.
- (line 99)
+ (line 113)
* -after-date and -update compared: after. (line 19)
* -newer-mtime and -update compared: after. (line 19)
* A lone zero block at, warning message: warnings. (line 35)
(line 23)
* all: warnings. (line 28)
* alone-zero-block: warnings. (line 35)
+* alternative decompression programs: gzip. (line 54)
* am in date strings: Time of day items. (line 22)
* Appending files to an Archive: appending files. (line 6)
* appending files to existing archive: append. (line 6)
(line 11)
* backups <1>: Backups. (line 6)
* backups: backup. (line 41)
-* bad-dumpdir: warnings. (line 102)
+* bad-dumpdir: warnings. (line 116)
* basic operations: Operations. (line 6)
* Bazaar, excluding files: exclude. (line 37)
* beginning of time, for POSIX: Seconds since the Epoch.
* Concatenating Archives: concatenate. (line 6)
* contains a cache directory tag, warning message: warnings. (line 43)
* contiguous-cast: warnings. (line 74)
-* corrupted archives <1>: gzip. (line 134)
+* corrupted archives <1>: gzip. (line 146)
* corrupted archives: Full Dumps. (line 8)
* Creation of the archive: create. (line 8)
* Current %s is newer or same age, warning message: warnings. (line 83)
* day in date strings: Relative items in date strings.
(line 15)
* day of week item: Day of week items. (line 6)
+* decompress-program: warnings. (line 89)
* Deleting files from an archive: delete. (line 6)
* Deleting from tape archives: delete. (line 17)
* dereferencing hard links: hard links. (line 6)
* GNU.sparse.offset, extended header variable: PAX 0. (line 18)
* GNU.sparse.realsize, extended header variable: PAX 1. (line 24)
* GNU.sparse.size, extended header variable: PAX 0. (line 11)
-* gnupg, using with tar: gzip. (line 181)
-* gpg, using with tar: gzip. (line 181)
+* gnupg, using with tar: gzip. (line 193)
+* gpg, using with tar: gzip. (line 193)
* gzip: gzip. (line 6)
* hard links, dereferencing: hard links. (line 6)
* header-col: Configuring Help Summary.
* MacKenzie, David: Authors of parse_datetime.
(line 6)
* Malformed dumpdir: 'X' never used, warning message: warnings.
- (line 102)
+ (line 116)
* member: Definitions. (line 15)
* member name: Definitions. (line 15)
* members, multiple: multiple. (line 6)
* Naming an archive: file. (line 6)
* negative time stamps: Large or Negative Values.
(line 6)
-* new-directory: warnings. (line 96)
+* new-directory: warnings. (line 110)
* next DAY: Day of week items. (line 15)
* next in date strings: General date syntax. (line 26)
* none: warnings. (line 29)
* Remote devices: file. (line 60)
* remote tape drive: Remote Tape Server. (line 6)
* Removing files from an archive: delete. (line 6)
-* rename-directory: warnings. (line 94)
+* rename-directory: warnings. (line 108)
* Replacing members with other members: append. (line 47)
* reporting bugs: Reports. (line 6)
* RESTORE_BEGIN: User Hooks. (line 39)
* Updating an archive: update. (line 6)
* usage-indent: Configuring Help Summary.
(line 154)
-* Using encrypted archives: gzip. (line 181)
+* Using encrypted archives: gzip. (line 193)
* ustar archive format: ustar. (line 6)
* uuencode: Applications. (line 8)
* v7 archive format: old. (line 6)
projects / debian / tar / blobdiff