FILES=”test.xml”
# for loop read each file
for f in $FILES
do
INF=”$f”
OUTF=”$f.out.tmp”
# replace javascript
sed ‘//d;//d’ $INF > $OUTF
/bin/cp $OUTF $INF
/bin/rm -f $OUTF
done

http://en.kioskea.net/faq/sujet-1451-sed-delete-one-or-more-lines-from-a-file

http://www.oracle.com/technology/pub/articles/dulaney_sed.html