get the absolute path from a relative path in Tcl

Question

Say I have a file, named ./ko
I want it's full path, which can be (for example) /foo/bar/ko
In Perl, one just does

File::Spec->rel2abs("./ko")

In Ruby, it is:

File.expand_path("./ko")

How is that done in Tcl?

Corollary

Answer 1

Use file normalize:

file normalize ./ko

Downspout