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OT: sed help

sorry for this OT question regarding sed.

I'm trying to take command line user input and pipe it to sed for
parsing.  currently i have this

[joshua:] vi test

echo $VALUE1 $VALUE2 > text.tmp
sed 's/$VALUE1/$VALUE2/' text.tmp > textfile

for some reason this doesn't work when I try

[joshua:] sh test test1 test2

any ideas why?  I'm certainly no sed expert as many can see.  What would
be the easiest way to implement this?

- James