Extracting the value of an attribute tag from XML Post: 302416208

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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

04-25-2010

Registered User

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!

JesterMania

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LEARN ABOUT DEBIAN

gfxattr

GFXATTR(1)																GFXATTR(1)

NAME

       gfxattr - Manipulate extended attributes in Gfarm file system

SYNOPSIS

       gfxattr [ -s | -g | -l | -r ] [ -x ] [ -c | -m ] [ -f xattrfile ] file [ xattrname ]

DESCRIPTION

       gfxattr	manipulates  extended  attributes and XML extended attributes of a specified file.  An extended attribute consists of an attribute
       name and an attribute value, which are arbitrary strings.  An XML extended attribute is an  extended  attribute	having	an  XML  attribute
       value.  Since XML extended attributes have a different name space from extended attributes, the same attribute name can be used.

       When  the -x option is specified, XML extended attributes are manipulated.  It is possible to search XML extended attributes by XPath query
       using gffindxmlattr command.

       All files and directories in Gfarm file system can keep extended attributes.  When removing a file or directory,  the  associated  extended
       attributes are also removed.

       Either -s, -g, -l, or -r option should be specified.

OPTIONS

       -s     sets  a  new value with an extended attribute xattrname for a specified file.  With the -f option, the value can be specified by the
	      file xattrfile instead of by the standard input.	When neither -c nor -m option is specified, the extended attribute is  overwritten
	      if it is already set.

       -g     reads a value with an extended attribute xattrname for a specified file.

       -l     display a list of extended attributes for a specified file.

       -r     removes a extended attribute xattrname for a specified file.

       -x     manipulates XML extended attributes.

       -c     sets a new extended attribute if it is not set.  This option is used with the -s option.

       -m     modifies the extended attribute if there it is.  This option is used with the -s option.

       -f xattrfile
	      With  the  -s  option,  reads  an  extended  attribute from the specified xattrfile instead of from the standard input.  With the -g
	      option, writes the extended attribute to the specified xattrfile instead of to the standard output.

       -?     displays usage.

SEE ALSO

       gffindxmlattr(1)

Gfarm								  18 August 2009							GFXATTR(1)