[gradsusr] Not to use 'write' command

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Hi, everyone,

I'd like to save GRADS output  as ascii text file.
I tried to run below script;

'open sample.ctl'
'set t 1 5'
'set z 4'
'set gxout print'
'd tk'
ret=write(test.txt, result)

Error description below was come out;

  Syntax Error : Invalid Operand
  'write' not a variable or function name
  Error occurred at column 1
DEFINE error : Invalid expression

I tried to use two version of GRADS: 1.9b4 and 2.1.1.b0 on CentOS6 linux.
I want to know a reason not to use 'write' command and how to save GRADS 
outputs as ascii text file.

Sincerely yours,

Hideki Ueyama
National Agriculture and Food Research Organization