Control File V$ Views

V$DATABASE - Displays database information from the control file
V$CONTROLFILE - Lists the names of control files
V$CONTROLFILE_RECORD_SECTION - Displays information about control file record sections
V$PARAMETER - Can be used to display the names of control files as specified in the CONTROL_FILES initialization parameter

SQL> SELECT NAME FROM V$CONTROLFILE;

NAME
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/u01/oracle/prod/control01.ctl
/u02/oracle/prod/control02.ctl
/u03/oracle/prod/control03.ctl