[PATCH] commands: add 'findstr' to get string from file

[Sascha Hauer]

Hi Christoph,

On Tue, May 20, 2014 at 07:27:55PM +0200, Christoph Fritz wrote:
> Command 'findstr' can be for example used to find the string
> "MAC=1C:BA:8C:F3:82:BB" in file /dev/eeprom0 to set the
> appropriate variable:
> 
>  $ findstr -o 4 -l 17 -t eth0.ethaddr MAC /dev/eeprom0
> 
> Usage: findstr [OPTIONS] <STRING> <FILE>
> Find string in file and print it
> -o <offset>     set offset of string which gets printed
> -l <length>     set length of string which gets printed
> -t <var>        print into variable instead of stdio

I wonder how useful such a command is. I mean normally I would
expect a MAC address to be stored in binary format and not ASCII.
Matching 'MAC' (what about the '='?) seems not very robust. What about
strings with dynamic lengths?
If the command is primarily intended for the MAC address then maybe
a more dedicated command or a piece of code called from board code
is more robust. If the command is intended as a general
eeprom-variable-store then I think it's not flexible enough.

Sascha

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