Use 'printf' (POSIX issue 4) instead of 'echo -n', for portability.

Use 'printf' (POSIX issue 4) instead of 'echo -n', for portability.

The problem with using 'echo -n' is that it is not portable.  While BSD systems
required that the '-n' option be removed and interpreted, System V required
that all strings should be echoed with no interpretation of options.  This
fundamental difference of behavior means that it is never possible to use the
'-n' flag to echo in tests which are meant to be portable.

In this case, on Mac OS X 10.6, the /bin/sh shell builtin 'echo' uses the
System V semantics of the command, and thus the SHELL test failed on that
platform.

http://pubs.opengroup.org/onlinepubs/009695399/utilities/echo.html#tag_04_41_16

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