get rid of xml comment by grep or sed

Shell Programming and Scripting
1

Hi,

I would like to get rid of all comment in an xml file by grep or sed command:
The content seem like this:

<!-- ab cd 
       ef gh
       ij kl  -->

Anyone can help?

Thanks and Regards

2

this will delete that part

sed '/<!--/,/-->/d' filename
3

it works!!
thank you very much!!

4

perl:

undef $/;
my $str=<DATA>;
$str=~s/<!--.*?>\n//gs;
print $str;
__DATA__
<!-- ab cd 
ef gh
ij kl -->
line 1
<!-- ab cd 
ef gh
ij kl -->
line 2