Hi TigerLiu@viatech.com.cn,

On Mon, 22 Jul 2013 19:06:33 +0800, TigerLiu@viatech.com.cn wrote:

Hi, Albert:

...

See the Denx U-Boot documentation, more precisely: http://www.denx.de/wiki/view/DULG/CommandLineParsing#Section_14.2.17.

From this web page, it seems hush-shell support "for" iteration. So, i wrote a simple script as below: for(i=1;i<10;i++) do echo "lion-0722" done

Then, i used mkimage tool to produce a script. Then, i load it to dram, and run it with autoscr cmd. But failed, the log message is: LION # fatload mmc 0:1 0 scriptcmd0722 reading scriptcmd0722 120 bytes read LION # autoscr 0 ## Executing script at 00000000 Unknown command 'for(i=1' - try 'help' Unknown command 'i<10' - try 'help' Unknown command 'i++)' - try 'help' syntax error syntax error ... ...

Did you try the commands live in your U-Boot console?

Did you make sure hush shell is enabled in your U-boot?

Best wishes,

Amicalement,

Hi TigerLiu@viatech.com.cn,

On Mon, 22 Jul 2013 19:44:18 +0800, TigerLiu@viatech.com.cn wrote:

Hi, Albert:

...

Did you try the commands live in your U-Boot console? Did you make sure hush shell is enabled in your U-boot?

I am sure I have enabled hush shell.

I think "for" iteration syntax is error: "for(i=1;i<10;i++)"

But I don't know how to write it correctly!

This is why I suggested that you experiment in your U-Boot console, where you can quickly try things. One thing I'd test first is whether your C-like use of 'for' is valid at all for Hush, or for Bourne shell (from which Hush derives IIUC) -- I suspect it might not be.

Best wishes,

Amicalement,

Hi, James:

Try something like => for i in a b c; do

...

echo $i done

a b c =>

Your suggestion is right! Thank you!

Best wishes,