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find and replace using SED

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# 1  
Old 10-19-2011
find and replace using SED
I need to do a find and replace. I tried below logic but getting warnings Could you please help?
Code:
a=`echo "<!DOCTYPE aaaaa bbbbb  \"sample.dtd\">"`
b="<!DOCTYPE  aaaaa bbbbb  \" /a/b/c/datain/d_k/sample.dtd \">"
echo $a | sed -e "s/$a/$b/" > c.txt

getting the following error
Code:
sed: 0602-404 Function s/<!DOCTYPE aaaaa bbbbb  "sample.dtd">/<!DOCTYPE  aaaaa bbbbb  " /a/b/c/datain/d_k/sample.dtd ">/ cannot be parsed.

Thanks
Krishnakanth Manivannan

Moderator's Comments:
Mod Comment Please use code tags
Last edited by zaxxon; 10-19-2011 at 08:59 AM.. Reason: code tags, see PM
# 2  
Old 10-19-2011
use different delimiter other than '/' in sed like '?' or ':'
because / is included in your variables a and b ,therefore you are getting errror.
use either of these sed commands in your last line.
Code:
 
   1) echo $a | sed -e "s:$a:$b:" > c.txt
   2) echo $a | sed -e "s?$a?$b?"  > c.txt

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