From: Darren Tucker <dtucker@dtucker.net>
Date: Mon, 18 May 2020 23:22:01 GMT
Subject: Re: [PATCH 1/7] Redirect grep's stderr top null too.
Message-ID: <CALDDTe0BvyXYz39n0EqGnJgdfHMziwW7V5xQO_H=+OKm20jfFA@mail.gmail.com>
In-Reply-To: <20200518153025.GD1980@danh.dev>

On Tue, 19 May 2020 at 01:30, Đoàn Trần Công Danh <congdanhqx@gmail.com> wrote:
[...]
> > printf: \3: invalid escape
>
> Look like HP-UX's printf doesn't understand octal escape.

The HP-UX one is actually OK with that.  The error is from an old gnu
coreutils (2.0), and it's complaining because there no leading zero,
which POSIX says octal escapes have:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/printf.html

"""
The following <backslash>-escape sequences shall be supported:
[...]
"\0ddd", where ddd is a zero, one, two, or three-digit octal number
that shall be converted to a byte with the numeric value specified by
the octal number
"""

$ /usr/local/bin/printf '\03' | od -x
0000000 0300
0000001
$ /usr/local/bin/printf '\3' | od -x
/usr/local/bin/printf: \3: invalid escape
0000000

-- 
Darren Tucker (dtucker at dtucker.net)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA (new)
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.