I had the same question, that was answered by typing this into REPL:

user=> (doc *file*)

Output:

-------------------------
clojure.core/*file*
nil
  The path of the file being evaluated, as a String.
  Evaluates to nil when there is no file, eg. in the REPL.



On Jan 29, 7:03 am, wubbie <sunj...@gmail.com> wrote:
> Hello,
>
> As you see, java.io.File. construct takes path argument but it is the
> first line of code and I don't know how *file* gets value of current
> directory.
>
> #!/usr/bin/env clj
>
> (add-classpath (str "file://" (.getParent (java.io.File. *file*))
> "/"))
>
> (ns mire
>   (:use [mire commands player rooms])
>   (:use [clojure.contrib server-socket duck-streams]))
> ....
>
> thanks,
> sun
>
> On Jan 28, 8:05 pm, wubbie <sunj...@gmail.com> wrote:
>
> > Hi,
>
> > I see
> > (add-classpath (str "file://" (.getParent (java.io.File. *file*))
> > "/"))
> > in mire.clj.
> > What value of *file* is it? I failed to see *file* is assigned at all.
>
> > -thanks
> > sun

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