It is certainly possible to import an earlier version dump file with a more recent version import utility. To import the entire contents of the dump file, perform a FULL import as follows:
imp userid=system/manager file=exp.dmp log=imp.log full=yIf any of these parameters are confusing, then please read the Oracle Utilities Guide for your specific version.
If you are receiving an error that the command is unknown, then it is highly likely that you do not have your PATH environment variable set to include the ORACLE_HOME/bin directory. Find the ORACLE_HOME directory on your machine. In that directory will be the import executable (imp on Unix/Linux and imp.exe on Windows). Add this directory to your PATH environment variable and try the operation again.
This was first published in June 2005