What Cinderella did - sorting the bytes Post: 302148405

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Top Forums Shell Programming and Scripting What Cinderella did - sorting the bytes Post 302148405 by Perderabo on Saturday 1st of December 2007 01:02:16 PM

12-01-2007

Administrator Emeritus

I found this in the info page for gnu tar:

Quote:

Verbose output appears on the standard output except when an archive is being written to the standard output, as with ‘tar --create --file=- --verbose’ (‘tar cfv -’, or even ‘tar cv’—if the installer let standard output be the default archive). In that case tar writes verbose output to the standard error stream.

So leaving off the f option and the /dev/stdout would have still sent the archive to the pipeline and the listing to the terminal. So yes, you do have a garbled archive. I don't see an obvious way to script your proposed solution. But worse, I see acouple of potential problems with it...

Problem one: "/home" probably appears somewhere in the good part of the archive and your solution would then drop bytes from the archive.

Problem two: The output of the listing was probably buffered because it was going to a non-tty, so blocks of lising may be interspersed and you may have lines split between blocks. So "/home/this/that" might not have fit in the buffer. So "/home/th" was put in and the buffer was written. Then "is/that{lf}" is placed in the buffer. But meanwhile output buffers of the archive are being written.

Sorry for the bad news, but I doubt that the archive can be salvaged.

Perderabo

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LEARN ABOUT MOJAVE

shape_tar

SHAPE_TAR(1)						      General Commands Manual						      SHAPE_TAR(1)

NAME

       shape_tar - shapeTools RMS bundle up subsystem in a tar or shar archive

SYNOPSIS

	shape tar[VERSIONS=<version_selection_rule>] [ARCHIVE=<filename>]

       shape shar[VERSIONS=<version_selection_rule>] [ARCHIVE=<filename>]

DESCRIPTION

       Shape tar and shape shar create a tar or a shar archive containing all source components of the current node in the system tree. All source
       components listed in the COMPONENTS macro in the Makefile and the release identification file (VERSIONFILE) are	written  to  the  archive.
       Components of subsystems are not included in the archive file.

       The  VERSIONS  macro  may  be  set  to  specify a version selection rule to be active during archive file creation. Default is most_recent,
       selecting the most recent version of each component. See shape_stdrul(7) or the $(SHAPELIBPATH)/stdrules for other possible  settings.  You
       may also use self defined version selection rules as VERSIONS.

       ARCHIVE	is  the base name of the file where the output shall be written to. Default is $(SUBSYSTEMNAME). The output file gets the filename
       extension .tar (resp. .shar).  When ARCHIVE=- is given, data will be written to standard output.

SEE ALSO

       shape_RMS(1), shape_stdrul(7)

FILES

       $(SUBSYSTEMNAME).tar $(SUBSYSTEMNAME).shar

21.8.119															      SHAPE_TAR(1)