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using sed with xml files

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# 1  
Old 03-16-2006
using sed with xml files
Hello
I'm working on a project modifying XML files in Unix and, I would like to use sed to change these values. For example, I've got a tag <book>354678209<\book> and I want to replace the value 354678209 with a another value without having to go into the file and change it manually. How can I do that using sed?
# 2  
Old 03-16-2006
Code:
sed -e 's_\(<book>\)[0-9]*\(<\\book>\)_\11234567890\2_g'

The number in bold 1234567890 is the new number. It will replace whatever value is found between the book tags.
# 3  
Old 03-16-2006
Of course you could use sed for this task,
as was shown by vino.
But parsing XML with sed seems like auto-flagellation to me.
I surely would recommend Perl to the rescue. Smilie
# 4  
Old 03-16-2006
You could use [gn]awk...
Code:
BEGIN { FS = "[<|>]" }
{
        if ($2 == "book") {
                sub($3, "01234")
        }
        print
}

If you feel the need to use perl, you can feed the above code through a2p...
Code:
$[ = 1;
$FS = '[<|>]';

while (<>) {
    @Fld = split($FS, $_, 9999);
    if ($Fld[2] eq 'book') {
        $s = $Fld[3], s/$s/01234/;
    }
    print $_;
}

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