[U-Boot] Guide to hush shell in u-boot

[U-Boot] Guide to hush shell in u-boot

[Nathan Holder]

Anyone know where a guide to hush shell in u-boot would be?
-Nate

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[U-Boot] Guide to hush shell in u-boot

[Wolfgang Denk]

Dear Nathan,

In message <DM2PR0801MB074714EDE8C3FE14EC26A019B3E20@DM2PR0801MB0747.namprd08.prod.outlook.com> you wrote:
>
> Anyone know where a guide to hush shell in u-boot would be?

There is none.  The hush shell was copied from the busybox project
(and I have to admit that I don't know where they got it from).
Bysybox does not document it's use either...

> This email and any files transmitted with it are confidential and
> are intended solely for the use of the individual or entity to
> whom they are addressed...

This is a silly note when posting to a public mailing list,  Please
switch this off.  If this is not possible from the account you are
using, then please consider using a free account without such
nonsense footers when posting to public lists.

Thanks.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Applying computer technology is simply finding the  right  wrench  to
pound in the correct screw.

[U-Boot] Guide to hush shell in u-boot

[Nathan Holder]

Hi Wolfgang,

How do people usually learn u-boot command line, scripting, and hush shell
without any kind of syntax guide?

-Nate

Dear Nathan,



In message <
DM2PR0801MB074718634A75D114D3D5CD52B3E20@DM2PR0801MB0747.namprd08.prod.outlook.com>
you wrote:

> This manual http://www.denx.de/wiki/DULG/Manual

> is out of date and missing a lot of info.

> I have been using it thinking it was the official manual.



It is. And it is organized  in the form of a wiki, where each and every
U-Boot user has the opportnity to contribute, to fix bugs and to add
missing parts.



> But then I learned many commands are not listed there.



Well, maybe you could help and add what you find is missing?



> Please take down the manual so that people don't mistakenly use it
thinking it is correct.



This is IMO a stupid request.  Incomplete documentation is still better
than no documentation at all.  Instead of complaining it would be more
helpful if you supporteed the community by adding to and improving the
documentation.



Thanks.



Wolfgang Denk



-- 

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk

HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de If
you can't explain it to a six year old, you  don't  understand  it

yourself.                                           - Albert Einstein

[U-Boot] Guide to hush shell in u-boot

[Lukasz Majewski]

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[-- Attachment #1: Type: text/plain; charset="windows-1254", Size: 2313 bytes --]

Hi Nathan,

> Hi Wolfgang,
> 
> How do people usually learn u-boot command line, scripting, and hush
> shell without any kind of syntax guide?

It is very similar to standard dash, without many "advanced features".

In short - you can count that you will have return value of executed
command, which can be checked.

Also some looping is supported (like iterating through all emmc
devices in boot scripts).

The best approaches:

1. grep the ./include/configs directory to see already working scripts

2. You may want to look into ./boards/samsung/common/bootscript/*.cmd
to see how to create script file (which may be read from e.g. fat
partition)

3. Look into source code - for example the ./cmd/test.c


Best regards,
Łukasz Majewski

> 
> -Nate
> 
> Dear Nathan,
> 
> 
> 
> In message <
> DM2PR0801MB074718634A75D114D3D5CD52B3E20 at DM2PR0801MB0747.namprd08.prod.outlook.com>  
> you wrote:
> 
> > This manual http://www.denx.de/wiki/DULG/Manual  
> 
> > is out of date and missing a lot of info.  
> 
> > I have been using it thinking it was the official manual.  
> 
> 
> 
> It is. And it is organized  in the form of a wiki, where each and
> every U-Boot user has the opportnity to contribute, to fix bugs and
> to add missing parts.
> 
> 
> 
> > But then I learned many commands are not listed there.  
> 
> 
> 
> Well, maybe you could help and add what you find is missing?
> 
> 
> 
> > Please take down the manual so that people don't mistakenly use it  
> thinking it is correct.
> 
> 
> 
> This is IMO a stupid request.  Incomplete documentation is still
> better than no documentation at all.  Instead of complaining it would
> be more helpful if you supporteed the community by adding to and
> improving the documentation.
> 
> 
> 
> Thanks.
> 
> 
> 
> Wolfgang Denk
> 
> 
> 




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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[U-Boot] Guide to hush shell in u-boot

[Wolfgang Denk]

Dear Nathan,

In message <CAGdamPC_zgEmkmT9+HfJTXo13f17OtbB1ar7bHUGz7GzHh_Uiw@mail.gmail.com> you wrote:
> 
> How do people usually learn u-boot command line, scripting, and hush shell
> without any kind of syntax guide?

Well, it's mostly just a POSIX compatible shell with a number of
restrictions and warts. Usually one starts writing scripts like you
would do in any other POSIX shell.  You will quickly see what is not
supported.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
It is common sense to take a method and try it. If it fails, admit it
frankly and try another. But above all, try something.
                                              - Franklin D. Roosevelt