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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xmlstarlet

XMLSTARLET(1)                                                    xmlstarlet Manual                                                   XMLSTARLET(1)

NAME

       xmlstarlet - command line XML/XSLT toolkit

SYNOPSIS

       xmlstarlet [<options>] [<command>] [<cmd-options>]

INTRODUCTION

       XMLStarlet is a set of command line utilities (tools) which can be used to transform, query, validate, and edit XML documents and files us-
       ing simple set of shell commands in similar way it is done for plain text files using UNIX grep, sed, awk, diff, patch, join, etc commands.
       This  set of command line utilities can be used by those who deal with many XML documents on UNIX shell command prompt as well as for auto-
       mated XML processing with shell scripts.

OPTIONS

       --version
              Display the version of xmlstarlet.

       --help Display help.

COMMANDS

       Type: xmlstarlet <command> --help <ENTER> for command help

       Available commands include:

       ed (or edit)
              Edit/update XML document(s).

       sel (or select)
              Select data or query XML document(s) (XPATH, etc).

       tr (or transform)
              Transform XML documents(s) using XSLT.

       val (or validate)
              Validate XML document(s) (well-formed/DTD/XSD/RelaxNG).

       fo (or format)
              Format XML document(s).

       el (or elements)
              Display element structure of XML document.

       c14n (or canonic)
              XML canonicalization.

       ls (or list)
              List directory as XML.

       esc (or escape)
              Escape special XML characters.

       unesc (or unescape)
              Unescape special XML characters.

       pyx (or xmln)
              Convert XML into PYX format (based on ESIS - ISO 8879).

       p2x (or depyx)
              Convert PYX into XML.

REFERENCES

       XMLStarlet is a command line  toolkit  to  query/edit/check/transform  XML  documents  (for  more  information  see  http://xmlstar.source-
       forge.net/).

AUTHOR

       Mikhail Grushinskiy.

                                                                                                                                     XMLSTARLET(1)