On Wed, Jun 22, 2016 at 11:29 AM, Duy Nguyen <pclouds@xxxxxxxxx> wrote:
>
> Can any shell wizards explain this to me? With this code
>
> BS=\\
> echo ${BS}${BS}
>
> Debian's dash returns a single backslash while bash returns two
> backslashes. Section 2.2.1 [1] does not say anything about one
> backslash (hidden behind a variable!) after escaping the following one
> and still eats the one after that..
>
> [1] http://pubs.opengroup.org/onlinepubs/009604499/utilities/xcu_chap02.html
I am not a wizard, but is the difference between the shell syntax, or just their
implementation of builtin-echo? IOW, how do these three compare?
printf "%s\n" "${BS}${BS}"
echo "${BS}${BS}"
echo ${BS}$BS}
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