bug#32703: echo_man_error

[Eric Blake]

On 9/11/18 11:01 AM, Eric Blake wrote:

> $ POSIXLY_CORRECT=1 /bin/echo a\\nb
> a\nb
>
> Yikes!  Even though we asked for POSIX correctness, we are NOT 
> interpreting backslashes.  I think this is a bug in GNU coreutils' echo, 
> and could be fixed by the patch below (but the testsuite would also need 
> updates).

And it might even be a regression.  Reading through NEWS, I found this 
back in 5.3.0:

  echo now conforms to POSIX better.  It supports the \0ooo syntax for
  octal escapes, and \c now terminates printing immediately.  If
  POSIXLY_CORRECT is set and the first argument is not "-n", echo now
  outputs all option-like arguments instead of treating them as options.

although I haven't actually tested prior versions to see if behavior has 
changed over time.

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
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