Search notes:

$ORACLE_HOME/bin/dbfsize

dbfize determines database file type and size: 
$ $ORACLE_HOME/bin/dbfsize /opt/oracle/oradata/DB/sysaux01.dbf

Database file: /opt/oracle/oradata/DB/sysaux01.dbf
Database file type: file system
Database file size: 56320 8192 byte blocks

See also

$ORACLE_HOME/bin

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