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Tar 1.20

Item posted by Sergey Poznyakoff <gray> on Mon 14 Apr 2008 02:33:01 PM UTC.

GNU tar 1.20 is available for download from

New in this version:

  • New option --auto-compress (-a)

With --create, selects compression algorithm basing on the suffix of the archive file name.

  • New option --lzma

Selects LZMA compression algorithm

  • New option --hard-dereference

During archive creation, dereferences hard links and stores the files they refer to, instead of creating usual hard link members (type '1').

  • New option --checkpoint-action

This action allows to specify an action to be executed upon hitting a checkpoint.  Recognized actions are: dot, echo (the default), echo=string, ttyout=string, exec=cmdline, and sleep=value.  Any number of `--checkpoint-action' options can be specified, the actions will be executed in order of their appearance in the command line. 

See documentation, section 3.8 "Checkpoints" for a complete description.

  • New options --no-check-device, --check-device.

The `--no-check-device' option disables comparing device numbers during preparatory stage of an incremental dump.  This allows to avoid creating full dumps if the device numbers change (e.g. when using an LVM snapshot).

The `--check-device' option enables comparing device numbers.  This is the default.  This option is provided to undo the effect of the previous `--no-check-device' option, e.g. if it was set in TAR_OPTIONS environment variable.

  • The --transform option.

Any number of `--transform' options can be given in the command line. The specified transformations will be applied in turn.

The argument to `--transform' option can be a list of replace
expressions, separated by a semicolon (as in `sed').

Filename transformations are applied to symbolic link targets
during both creation and extraction.  Tar 1.19 used them only
during extraction.

For a detailed description, see documentation, section 6.7 "Modifying File and Member Names".

  • Info (end-of-volume) scripts

The value of the blocking factor is made available to info and
checkpoint scripts via environment variable TAR_BLOCKING_FACTOR.

  • Incremental archives

Improved (sped up) extracting from incremental archives.

  • Bugfixes.
    • Fix bug introduced in version 1.19: tar refused to update non-existing archives.

No messages in Tar 1.20


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