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Top Forums Shell Programming and Scripting Extracting the value of an attribute tag from XML Post 302416208 by JesterMania on Sunday 25th of April 2010 03:10:54 PM
Old 04-25-2010
Extracting the value of an attribute tag from XML

Greetings,

I am very new to the UNIX shell scripting and would like to learn. However, I am currently stuck on how to process the below sample of code from an XML file using UNIX comands:

Code:
<ATTRIBUTE NAME="Memory" VALUE="512MB"/>
<ATTRIBUTE NAME="CPU Speed" VALUE="3.0GHz"/>
<ATTRIBUTE NAME="Video Card" VALUE="4870"/>

Goal: Write a script to look for a certain attribute by name (i.e. "Memory") and return its value (i.e. "512MB" in this example).

Being new to shell scripting and UNIX in general, I had a very tough time trying to sort out whether to use awk, sed, grep, and the various other UNIX commands. My line of logic is to first grep the attribute name ("Memory") and I got that far, but I'm not sure how to cut the VALUE from the string.

Another frustrating thing is that the UNIX box I need to run this script on is pretty "vanilla" in the sense that it does not appear to have any sort of XML parsing tools such as xmlt, etc. so I am stuck with using the default UNIX commands.

If someone can kindly advise me on how to approach this issue, that would be much appreciated!
 

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mkmanifest(1)						      General Commands Manual						     mkmanifest(1)

NAME
mkmanifest - mtools utility to create a shell script to restore UNIX file names from DOS SYNOPSIS
mkmanifest [files] OPTIONS
None OPERANDS
A list of UNIX file names to be converted to DOS name format. DESCRIPTION
The mkmanifest command creates a shell script that aids in the restore of UNIX file names that were overwritten by DOS file name restric- tions. DOS file names are uppercase only, cannot exceed 8 character names, 3 character extensions and do not support device names or non- alphanumeric characters. Not all UNIX file names are supported in the DOS world. The mtools commands may have to change UNIX names to fit the DOS file name conven- tions. Most commands provide the verbose option (-v), that displays new file names if they have been changed. The following table shows some examples of file name conversions: ----------------------------------------------- UNIX name DOS name Reason for the change ----------------------------------------------- thisisatest THISISAT file name too long file.stuff FILE.STU extension too long prn.txt XRN.TXT PRN is a device name .abc X.ABC null file name hot+cold HOTXCOLD illegal character ----------------------------------------------- EXIT STATUS
The following exit values are returned: Success. Failure. EXAMPLES
Assume you have the following UNIX files that you want to copy to a DOS diskette using the mcopy command. very_long_name 2.many.dots illegal: good.c prn.dev Capital The mcopy command converts these file names to the following: very_lon 2xmany.dot illegalx good.c xprn.dev capital To restore the previous file names, use the mkmanifest command as follows: mkmanifest very_long_name 2.many.dots illegal: good.c prn.dev Capital > manifest The previous mkmanifest command line produces the following: mv very_lon very_long_name mv 2xmany.dot 2.many.dots mv illegalx illegal: mv xprn.dev prn.dev mv capital Capital The good.c file name did not require conversion, hence it was not included in the output. If these files were copied from diskette to another UNIX system, and you wanted to restore the original names, retain a copy of the mani- fest file (captured output) so that it can be used to convert the file names again. FILES
Executable file SEE ALSO
Commands: mcopy(1), mtools(1) mkmanifest(1)
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