The following trick could be used, if You want to start Oracle export as sysdba: use double quotes around the single quotes.

Warning! Dump consistency could not be guaranteed, if the export is done under sys user!

exp userid=" ‘/ as sysdba’ " parfile=exp.par

Possible parameter file:

file=mydump.dmp compress=n log=mydump.log direct=y full=n owner=SCOTT consistent=y feedback=10000 […]