On Wed, Jun 22, 2016 at 8:36 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> 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}
Great! printf shows two backslashes while both echo'es show one.
printf "\\\\" behaves like echo though. Doesn't matter, at least I
should be able to make the tests work on Debian dash.
--
Duy
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