- Avoid depending on the exact format of output from system (non-nmh)
programs.
+- Use octal instead of hex (\x) bytes in printf(1) formats, because hex
+ is not supported by POSIX printf.
+
The Heirloom Bourne Shell, http://heirloom.sourceforge.net/sh.html,
catches many non-portable shell constructs, such as $(), $(()), !, and
assignment in export statements.