there is no way to print the NUL byte with the echo utility
with an XSI shell (mksh, posh, yash):
$ sh -c 'echo \\0 | od -An -c'
\0 \n
with a shell that requires echo -e (ksh, bash, busybox, mksh):
$ sh -c 'echo -e \\0 | od -An -c'
\0 \n
with dash (XSI, no -e argument):
$ dash -c 'echo \\0 | od -An -c'
\n
where others characters are correctly printed:
$ dash -c 'echo \\0100 | od -An -c'
@ \n
with dash it only works with printf:
$ dash -c 'printf \\0\\n | od -An -c'
\0 \n
I discovered this bug developing a small shell library, where you can
find an use case in the n_bytes_encode function of the lib/bytes.sh file
included in http://www.trek.eu.org/devel/naive/naive-0.0.2.tar.gz
c-ya!
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