Re: \c-handling in $'-strings

[Helmut Karlowski]

Am 31.08.2015, 15:17 Uhr,SCHRIEB Chet Ramey <chet.ramey@case.edu>:

> Conversion to a control character is effected by ANDing with 0x1f, since
> the valid control character range is 0-0x1f.  If you have something  
> that's
> not a valid control character after being ANDed with 0x1f, you get
> undefined results.
>
> There is a table in
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/stty.html#tag_20_123

Do you refer to the table titled "Circumflex Control Characters in stty"?

It states for example:

?       <DEL>

Running:

echo $'\c?' |od -a
echo $'\c[\c\\c]\c^\c_\c?' |od -a

bash prints:

0000000  us  nl
0000002
0000000 esc  fs   c   ]  rs  us  us  nl

I'd expect:

0000000 del  nl
0000002
0000000 esc  fs  gs  rs  us del  nl

Also the ] in the output seems wrong, looks it gets the \\ wrong, though  
ksh93 does this also.

Not a serious issue ...

-Helmut