Execute several UNIX OS commands from inside Java program

Greetings,
I would like to be able to execute from a Java program several of the following UNIX commands
script filename
cd
date
grep
diff
I have been able to get a single command to work with
Runtime rt = Runtime.getRuntime();
Process p = rt.exec("dir");
My goal here is to accomplish a Java program which will use JDBC to access an Oracle database with SQL and then compare the resultant flat file with a diff command in Unix to another delimited file from an Excel spreadsheet. Your input is appreciated.
Thank you

I would suggeat to use JDBC to get the data from database and then read your file and then use existing java diff program from following link to find the differences between the files
http://www.bmsi.com/java/
I hope this helps
VAN

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Execute several UNIX OS commands from inside Java program

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