> Lastly since ^J is a newline you can generate one with echo "\n".

That does not work in bash-4.x.  Firstly, by default the bash builtin
'echo' supplies a trailing newline.  Secondly, backslash translation
requires the option "-e".

$ echo "\n"
\n
$ echo "\n" | od -c
0000000   \   n  \n
0000003
$

What does work is either of these:

$ echo '' | od -c
0000000  \n
0000001
$ echo -e -n '\n' | od -c
0000000  \n
0000001
$

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