Fix the shebang line.
Fix the shebang line.

POSIX compliant bourne shell implementations do not support array variables.  In
particular Debian/Ubuntu's /bin/dash (which is linked from /bin/sh) fails to
parse the script.

It should also fail in other platforms such as Solaris or BSD.

naveenkr/spark,gwern/spark,rupa/spark,holman/spark,lildude/spark