Make it more portable (now it works also with ksh)

echo behaviour differs across POSIX shells. Some shells expands strings like
'\\n' in echo built-in command (ksh), some does not (bash). According to [1]
both behaviours are correct. That means "echo" is not portable for strings
containing backslashes. [1] advises to use printf instead.

[1] http://www.opengroup.org/onlinepubs/009695399/utilities/echo.html

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