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$_, because that contains the original script name (in the case test.py, $_ contains .../test.py when this script is executed. Using $0 will work fine, as pwd -P will give the absolute physical path of the dart script. Review URL: https://codereview.chromium.org//10981070 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13030 260f80e4-7a28-3924-810f-c04153c831b5