Как вырезать текст между двумя тэгами в xml?

sed 's#\(<description>\).*\(</description>\)#\1'xxxxx'\2#g' test.xml > test2.xml
sed '/<description>/,/<\/description>/{//!d}' test.xml > test2.xml

sed '/<description>/{:1;$!N;/<\/description>/!b1;s/<\(description>\).*\(<\/\1\)/<\1"xxxx"\2/;}'

tag='description'
sed "/<$tag>/{h;d;};x;/<$tag>/!{x;b;};G;s/<\($tag>\).*\(<\/\1\)/<\1==\2/;t;h;$!d"

tag='description'
sed "/<$tag>/{h;d;};x;/<$tag>/!{x;b;};G;s/<\($tag>\).*\(<\/\1\)/<\1==\2/;t;h;$!d"

bash: !{x: event not found

tag='description'
sed "/<$tag>/{h;d;};x;/<$tag>/! {x;b;};G;s/<\($tag>\).*\(<\/\1\)/<\1==\2/;t;h;$! d"

sed '/<description>/{:1;$b;N;/<\/description>/! b1;s/<\(description>\).*\(<\/\1\)/<\1"xxxx"\2/;}'

sed '
    /<description>/{
        :1
        $b
        N
        /<\/description>/! b1
        /description>/{
            s//\x7/g
            s|\x7[^\x7]*</\x7|description>"xxxx"</description>|g
            /\x7/s//description>/
            t1
        }
   }'

perl -0pe 's|(description)>(?s).+?</\1|$1"xxxx"</$1|g'