redirect stdout

[Sascha Hauer]

On Wed, Jun 04, 2014 at 11:25:38AM +0200, Thibaut Dambry wrote:
> Hello
> 
> I'm sorry if it is a dummy question, but I don't find a answer.
> I would like do that in a barebox hush shell:
> 
> value=`i2c_read -a 0x52 -b 0 -r 0x01 -c 1`
> 
> But the shell don't interpret the ``.
> 
> Is there a method to do that ?

There is no redirection of any kind in barebox and this is not trivial
to implement.

You are trying to read a i2c register into a variable. This is not
possible with the current implementation of the i2c command. Some
commands work around this by adding a commandline parameter which lets
you specify a variable in which the result is written, see for example
the readline command. The i2c_read command could be extended similarly.

OTOH most of the time this comes up it is better to implement a proper
driver for the device. In case it's an EEPROM you're trying to access
here you also better write C Code to interpret its content. This kind
of shell parsing is often very fragile.

> 
> Thank you for this exciting software, I would contribute but I'm a
> little intimidate by the great quality of hackers in this list.

C'mon, we do not bite ;)

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |