Generate spool in based on condition in Oracle sql -

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i need write oracle sql script based on condition.

like user has type 'y' or 'n' if types 'y' need 

accept gen prompt 'enter y if want generate spool' default 'n' spool c:\a.spl      select cust_id no         acc_master         account_no='&crn'            , branch_no='&brn';       select * lid=no;     select * b lid=no;     select * c lid=no;  spool off;

if user types 'n' nothing needs selected.

please advise

if use bash statement ("if-fi") if use linux, or statement "if" windows work around it.


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