[ferret_users] -script, with arguments

[Aleksander Borowski IOPAN <alek.borowski@xxxxx>]

Dear FerretUsers,
I try to run a script, with optional arguments. Script like:

repeat/range=3:9:1/name=day \
(use hist.Rbalt48.20030`month`0`day`.nc; \
shade/k=2/lev=(-2,10,0.2) SALT*1000; \
frame/file=shgt11_`m`_k2.gif)

I'd like to run : ferret -gif -script new.jnl with argument [let month=1]

How to run new.jnl and add arguments to command line without rewrite a script ? 
Thank you in advance for your answer and any ideas.
Aleksander