xml parsing - SED - stripping certain tags from XML file -

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i have xml files littered tags this: 

<?xm-insertion_mark_start author="some_author" time="20050602t125956-0500"?>

how strip such inserts? i've tried avail: 

sed -e 's/<\?xm.*?\?>//g' in.xml > out.xml

instead of substitute (s) use delete (d) command of sed:

also use sed -i (inline) this:

sed -i.bak '/<?xm.*?>/d' in.xml

using grep:

grep -v '<\?xm.*\?>' in.xml > out.xml

caution: shell utilities not best tools parsing & editing xml data.


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