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Article:
  Learning the Mac OS X Terminal: Part 1
Subject:   behavior of cc in OS X terminal window
Date:   2001-12-21 20:24:42
From:   hokanstenholm
Response to: behavior of cc in OS X terminal window

To run a.out (or any other executable loacted in the same folder) you must write either ./a.out, ("." referes to the current directory) or you will have to add (or create) a "." to your PATH variable in ~/.tshrc, ~/.cshrc ... (~ = home dir, see do man on tcsh, csh ...).
The PATH variable includes all directory paths the will be used to look for a executable called a.out if you do "% a.out" but the "." directory isn't included by default.