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Full Discussion: tar not reading if output directed to /dev/null
Operating Systems Linux Ubuntu tar not reading if output directed to /dev/null Post 302351501 by bakunin on Tuesday 8th of September 2009 06:57:21 PM
Old 09-08-2009
First off, I'd like to state that i do NOT have a problem. I just want to achieve a better understanding. So you don't need to tell me workarounds, as i have already found one.

Quote:
Originally Posted by thegeek
Before that why you would want to tar and check the integrity, better you can do by reading all the files !!
This is exactly what i was expecting tar to do: read all the files.

Quote:
Originally Posted by methyl
The parameter after "-f" is the archive filename. A value of "-" when there is no pipeline has no sensible meaning
Sorry, but this is simply not true: the dash as a filename is signifying <stdout> and if i use a redirection or a pipeline to manipulate tars output further should make no difference.

In fact (as i have stated in my first post) the command worked the way i wrote it when i used a real file (instead of /dev/null) as output destination. It is this inconsistency - the command reading all the files when a real file is the destination and not working, when the destination is /dev/null - i want to understand.

bakunin
 

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LEARN ABOUT DEBIAN

ark

ARK(1)								 KDE User's Manual							    ARK(1)

NAME

       ark - KDE archiving tool

SYNOPSIS

       ark [-b] [-a] [-e] [-c] [-f suffix] [-p] [-t file] [-d] [-o directory] [KDE Generic Options] [Qt(TM) Generic Options]

DESCRIPTION

       Ark is a program for managing various compressed file formats within KDE. Archives can be viewed, extracted, created and modified with Ark.
       The program can handle various formats such as tar, gzip, bzip2, zip, rar (when the appropriate libraries or command-line programs are
       installed).

OPERATION MODES

       Ark can be used either as a stand-alone GUI program as well as a command-line program in order to perform some specific tasks.

       If invoked without the -b (--batch) or -c (--add) options, Ark is started as a normal GUI program.

       When the -b (--batch) option is used, Ark can be used to extract the contents of one or more files directly from the command-line, without
       launching its GUI.

       When the -c (--add) option is used, Ark prompts for files that should be added to a new archive or to an existing archive.

OPTIONS

       -d, --dialog
	   Show a dialog for specifying the options for a batch or add operation.

       -o, --destination directory
	   Default the extraction directory to directory. If not passed, the current path is used.

   Options for adding files
       -c, --add
	   Query the user for an archive filename and add specified files to it. Quit when finished.

       -t, --add-to filename
	   Add the specified files to filename. Create archive if it does not exist. Quit when finished.

       -p, --changetofirstpath
	   Change the current directory to the first entry and add all other entries relative to this one.

       -f, --autofilename suffix
	   Automatically choose a filename, with the selected suffix (for example rar, tar.gz, zip or any other supported types).

   Options for batch extraction
       b, --batch
	   Use the batch interface instead of the usual dialog. This option is implied if more than one url is specified.

       -e, --autodestination
	   The destination argument will be set to the path of the first file supplied.

       -a, --autosubfolder
	   Archive contents will be read, and if detected to not be a single folder archive, a subfolder by the name of the archive will be
	   created.

EXAMPLES

       ark --batch archive.tar.bz2
	   Will extract archive.tar.bz2 into the current directory without showing any GUI.

       ark -b -d archive.tar.bz2 archive2.zip
	   Will first show an extraction options dialog and then extract both archive.tar.bz2 and archive2.zip into the directory chosen in the
	   dialog.

       ark --add-to my-archive.zip photo1.jpg text.txt
	   Will create my-archive.zip if does not exist and then add photo1.jpg and text.txt to it.

AUTHORS

       Ark is currently maintained by Harald Hvaal haraldhv@stud.ntnu.no and Raphael Kubo da Costa kubito@gmail.com.

       This man page was first written by Lauri Watts lauri@kde.org in 2005 for KDE 3.4, and was later updated in 2009 by Raphael Kubo da Costa
       kubito@gmail.com.

AUTHORS

       Lauri Watts <lauri@kde.org>
	   Author.

       Raphael Kubo da Costa <kubito@gmail.com>
	   Author.

K Desktop Environment 2.13 (KD					    2009-09-10								    ARK(1)
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