How to remove new line character using sed?

cat $myfile
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signature.

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I want to remove newline character and insert a single whitespace so that

cat $myfile
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sed 's/\n/ /g' myfile
-----is not working

How to do this using sed?

pls help...

should work

Regards

I believe the O.P. wants to slurp all lines up one the first one, but this just removes blank lines. You can easily do it with perl. sed can probably do it too, but there's nothing wrong with a little variety eh?
This might cause you to wind up with some extra whitespace if you have blank lines or spaces at the start or end of lines. This will solve that problem:

Thanks matthewg42,

It solved my problem....

Realizing this a old thread but could be useful for someone to google the same question

In Perl you can do:
perl -pi.bk -e 's/^\s+$//' myfile

For brave souls you can skip the .bk part, but don't say I didn't warn you ;-)