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replacing multi lines with 1 line

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# 1  
Old 01-23-2012
replacing multi lines with 1 line
I have an xml file that is stripped down to output that looks bacically like;

Code:
         <!--   TABLEA header   -->
<tablea>
some fields
</tablea>
         <!--   TABLEB header   -->
         <!--   TABLEC header   -->
<tablec>
some fields
</tablec>

I want to remove the header where it contains no tag or field info (TABLEB) so output should look like;

Code:
         <!--   TABLEA header   -->
<tablea>
some fields
</tablea>
         <!--   TABLEC header   -->
<tablec>
some fields
</tablec>

In some cases files will have TABLEB info so only want to delete if no info is contained and the next line is another header comment. Any suggestions using a sed script or similar?
# 2  
Old 01-23-2012
Code:
sed '
/TABLE/ {N
/\n.*TABLE/ D
}' input

# 3  
Old 01-23-2012
Code:
sed '/<!--/{N;/\n.*<!--/D}'  infile

For inline file edit use -i option with sed sed -i ...

--ahamed
# 4  
Old 01-23-2012
Thanks guys, that worked perfectly
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