NASL SSH doubt from a newbie

Hi ,
Sorry to bug you all but I'm new to NASL and my first attempt to write
a useful NASL script failed :(

I've a problem regarding executing SSH commands in NASl.
I want to read a file on a remote machine using SSH from my nasl program.
Here is what i wrote:
##########################################################
 ssh_login 
(socket:soc,login:"nsroot",password:"nsroot",pub:NULL,priv:NULL,passphrase:NULL);

cmd1=ssh_cmd(socket:soc, cmd:"shell", timeout:5);
display('\ncmd1:',cmd1);

buf = ssh_cmd(socket:soc, cmd:"cat myfile", timeout:5);
display('\nbuf:',buf);
############################################################

i got the following output :
cmd1:
buf: Done
ERROR: No such command
-------------------------------------------------------------------------------------
i know the second command(cat myfile ) is not reaching the new shell
which is forked,
but i've tried a lot ,i still cudn't find out how to execute commands
on that newly forked shell.
Someone please help me. I know its a silly doubt.
If it cannot be done plz help me on how to read files from a remote
machine using SSH in a nasl program.
Thanks

-- 
Sometimes i think. Somtimes i am.
-sandy
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