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Full Discussion: set a variable and detect error status...
Top Forums Shell Programming and Scripting set a variable and detect error status... Post 302431991 by chebarbudo on Wednesday 23rd of June 2010 11:42:05 AM
Old 06-23-2010
Question set a variable and detect error status...
Hi there,

I'm driven crazy by a new problem.
It seems very complex to me and I see no way to come around.

In my script, I receive the path to a tgz file and I want to output the md5 sum of the file inside the tgz. I want a way to detect if tar fails.

I'm using the following command
Code:
tar -xzOf "$1" 2>/dev/null | md5sum | cut -b-32

  • If the tgz contains a regular file, this command returns its md5 sum.
  • If the tgz contains an empty file, it returns d41d8cd98f00b204e9800998ecf8427e.
  • If the tgz is corrupted, it will also return d41d8cd98f00b204e9800998ecf8427e.
Invoking the error code will not help because it will return the one of the last command which is cut.
How would you do that? I need to output the md5sum of the zipped file (empty or not) and I want something else (empty, error code, whatever) if the tgz is corrupted.

Can you help me?
Cheers
Santiago
 

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vfu

VFU(1)								 VFU File Manager							    VFU(1)

NAME

       vfu - VFU is console (text-mode) file manager for UNIX/Linux

SYNOPSIS

       vfu [options]

DESCRIPTION

       vfu has following features:

	- Fast one-key commands
	- Extended completition and wildcard expansion
	- Directory tree with sizes (incl. sizes cache)
	- File-type colorization (extension and type)
	- Archives support (TAR, TGZ, BZ2, and many more)
	- Simple FTP support through archive-like interface
	- Internal text/hex file viewer and editor (optional)
	- Extensive user-defined external support/utils
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	- and much more...

OPTIONS

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	-d path
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	-r
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	-t
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       These options are for using vfu in partial non-interactive mode.

	example: vfu -d /usr/local -i

CONFIGURATION

       vfu configuration is divided in two parts (files):

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       format is described below. vfu only reads vfu.conf, it never writes in it!

       vfu.options

       This file contains all Options/Toggles which can be changed from inside vfu -- Options menu. vfu.options is binary file and is overwritten
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       versions!

       Location of vfu.conf

       vfu.conf can be placed as any of:

	$HOME/.vfu/vfu.conf

	$HOME/$RC_PREFIX/vfu/vfu.conf  (if $RC_PREFIX is exported)

	/etc/vfu.conf

	/usr/local/etc/vfu.conf

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       Other files location

       All other files including vfu.options are placed in:

	$HOME/.vfu/

	$HOME/$RC_PREFIX/vfu/

       What is "$RC_PREFIX" and why to use it? Some more information for this can be found in the CONFIG file which is supplied with vfu package.

VFU.CONF
       This is a sample copy of vfu.conf with appropriate comments:

DISTRIBUTION

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	vfu-X.xx.src.tgz

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       binary package for version X.xx for `platform' platform

       examples:

	vfu-4.00.src.tgz

	vfu-4.00.bin.linux.glibc.tgz

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       All packages are TAR+GZIP .tgz, bz2 and zip are available on request.

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FILES

	$HOME/$RC_PREFIX/vfu/vfu.conf

       configuration, explained above

	$HOME/$RC_PREFIX/vfu/vfu.options

       options, explained above

	$HOME/$RC_PREFIX/vfu/vfu.history

       contains history lines

	$HOME/$RC_PREFIX/vfu/vfu.tree

       contains directory tree

       If you don't set $RC_PREFIX configuration files are:

	$HOME/.vfu/vfu.conf
	$HOME/.vfu/vfu.options
	$HOME/.vfu/vfu.history
	$HOME/.vfu/vfu.tree

TODO

       see the TODO file

BUGS

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AUTHOR

	Vladi Belperchinov-Shabanski "Cade"
	<cade@biscom.net> <cade@datamax.bg>
	http://cade.datamax.bg/
	http://cade.datamax.bg/vfu/

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