path name substitution in sed.

I want to substitute each occurence of ROOT with the
actual name.

For eg. My file name contains.


I want to substitute this ROOT with for eg. /home/user2/tmp.
With sed Iam able to use substitution with out a back slash.

I do not want to use perl or awk.

Can some body help me doing this.
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sed s:ROOT:/home/user2/tmp:g

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dear ozo,

try this, sed -e "s/ROOT/\/home\/user2\/tmp/g"

let me know if you have any more problems

sorry, it was suppose to dear meerak,

try this, sed -e "s/ROOT/\/home\/user2\/tmp/g"

let me know if you have any more problems

meerakAuthor Commented:
Actually I had already accepted ozo's answer. I thought I have
given points to him already. But I think something went wrong.

I can't use fredfan's suggestion because, the string to be
substitued is a shell variable and I do not know how many
"/" it contains. So I cannot escape it with \.

ozo's suggestion works out.
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