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From: Bob Proulx on 19 Jul 2010 15:10
Ron Johnson wrote:
> Subject: Re: usernames that start with capital letter?
> Why aren't they recommended?

A lot of things are technically allowed but historically were terrible
problems in practice. Mixed case user names. Spaces in user names.
Unusual characters in user names. All of have been terrible sources
of problems interoperating with other systems. Mostly it has been a
long evolutionary climb from lower case us-ascii toward general 8-bit
clean interfaces. For example email allows for it with RFC2821 but
recommends against it.

The local-part of a mailbox MUST BE treated as case sensitive.
Therefore, SMTP implementations MUST take care to preserve the case
of mailbox local-parts. Mailbox domains are not case sensitive. In
particular, for some hosts the user "smith" is different from the
user "Smith". However, exploiting the case sensitivity of mailbox
local-parts impedes interoperability and is discouraged.

And this doesn't take into consideration other related systems such as
NIS/YP and mixed system tools such as ftp and so forth. Remember Unix
is all about lower case (and often no vowels) and so assumptions have
been made all around.

If you really want to stress things then add spaces and utf-8
characters too. These days it /should/ work. But I wouldn't
recommend it. :-)

Also note that there must be at least one lower case letter or getty
will assume that you are using an upper case only terminal and will
set up the tty driver to map upper case to lower case with iuclc. The
old getty manual used to recommend using only lower case letters.

But I don't know of any specific problems with mixed case today. The
best advice I would have is to try it and see. File bugs if there are
problems. But note that it is a path less well traveled.

Bob
From: Paul Cartwright on 19 Jul 2010 15:20
On Mon July 19 2010, Bob Proulx wrote:
> Also note that there must be at least one lower case letter or getty
> will assume that you are using an upper case only terminal and will
> set up the tty driver to map upper case to lower case with iuclc.  The
> old getty manual used to recommend using only lower case letters.

I remember all too well running the tr command many times...
http://www.cyberciti.biz/faq/linux-unix-shell-programming-converting-lowercase-uppercase/

$ tr '[:upper:]' '[:lower:]' < input.txt > output.txt



--
Paul Cartwright
Registered Linux user # 367800
Registered Ubuntu User #12459


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From: Ron Johnson on 19 Jul 2010 19:00
On 07/19/2010 02:01 PM, Bob Proulx wrote:
> Ron Johnson wrote:
>> Subject: Re: usernames that start with capital letter?
>> Why aren't they recommended?
>
> A lot of things are technically allowed but historically were terrible
> problems in practice. Mixed case user names. Spaces in user names.
[snip lots of informative text]
>
> But I don't know of any specific problems with mixed case today. The
> best advice I would have is to try it and see. File bugs if there are
> problems. But note that it is a path less well traveled.
>

Thanks. This will simply(?) be a generic/guest account on the
centrally-located PC. It's the user that will stay logged in so
that people have quick access to Google, dict, etc.

--
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From: Kelly Clowers on 20 Jul 2010 00:40
On Mon, Jul 19, 2010 at 11:35, Ron Johnson <ron.l.johnson(a)cox.net> wrote:

<snip>
>
> Anyway, in a gooey world, you click on an icon.

Heretic! ;-)


Cheers,
Kelly Clowers


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From: Bob Proulx on 20 Jul 2010 01:10
Ron Johnson wrote:
> Thanks. This will simply(?) be a generic/guest account on the
> centrally-located PC. It's the user that will stay logged in so that
> people have quick access to Google, dict, etc.

If it is just a generic guest account then why go with the mixed case?
Why not just go with 'guest'? That would be the normal "guest" login. :-)

Bob
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