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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
Old 12-01-2007
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.
 

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TAR(1)							      General Commands Manual							    TAR(1)

NAME
tar - archiver SYNOPSIS
tar key [ file ... ] DESCRIPTION
Tar saves and restores file trees. It is most often used to transport a tree of files from one system to another. The key is a string that contains at most one function letter plus optional modifiers. Other arguments to the command are names of files or directories to be dumped or restored. A directory name implies all the contained files and subdirectories (recursively). The function is one of the following letters: c Create a new archive with the given files as contents. x Extract the named files from the archive. If a file is a directory, the directory is extracted recursively. Modes are restored if possible. If no file argument is given, extract the entire archive. If the archive contains multiple entries for a file, the lat- est one wins. t List all occurrences of each file in the archive, or of all files if there are no file arguments. r The named files are appended to the archive. The modifiers are: v (verbose) Print the name of each file treated preceded by the function letter. With t, give more details about the archive entries. f Use the next argument as the name of the archive instead of the default standard input (for keys x and t) or standard output (for keys c and r). u Use the next (numeric) argument as the user id for files in the output archive. This is only useful when moving files to a non-Plan 9 system. g Use the next (numeric) argument as the group id for files in the output archive. EXAMPLES
Tar can be used to copy hierarchies thus: {cd fromdir; tar c .} | {cd todir; tar x} SOURCE
/sys/src/cmd/tar.c SEE ALSO
ar(1), bundle(1), tapefs(1) BUGS
There is no way to ask for any but the last occurrence of a file. File path names are limited to 100 characters. The tar format allows specification of links and symbolic links, concepts foreign to Plan 9: they are ignored. TAR(1)
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