To export via the command line, you would type in a command (from the UNIX or DOS prompt) that looks something
exp system/manager full=y file=expdatORCL.dmp log=expdat.log compress=y rows=y
Note that you may use different parameters for your export so your command line export may look slightly different.
To export interactively, you simply type:
at the command line and follow the prompts.
To use a parameter file, place the parameters that you would normally provide at the command line into a file called something like expORCL.par, and call it from the command line like this:
One of those three trusted methods should work for you. If not, please submit another question with specific error messages and I will do my best to address them.
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