Determine path of file

I reference a file from a script through command line parameters.

I.e.
script.sh [referenced file]

The file can be refered to as both absolute and relative path. How can
I easily get the complete (absolute) path independent on whether it is
specified absolute or relative.

I tried with addition of $pwd, but in case of an absolute reference I
run into problems with two consecutive slashes, e.g. /home/kbn/path//
home/kbn/path/file

At the moment I use sed, but I assume some more easy/pretty solutions
exist(?)

Best regards,
Kenneth (the number-one-question-maker)
.

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