Code:
C:\exp '/as sysdba' full=y file=ds.dmp

Export: Release 10.1.0.2.0 - Production on Sat Mar 19 16:42:34 2005

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EXP-00004: invalid username or password
Username: / as sysdba

EXP-00008: ORACLE error 1219 encountered
ORA-01219: database not open: queries allowed on fixed tables/views only
EXP-00000: Export terminated unsuccessfully