Oracle Technical Member Staff interview questions

How you Analyse thread dumps, steps to conclude, which kind of queue you mainly look for? how you resolve stuck threads immediately? what is kill command, why -3, etc?

In Unix command for number of occurrences of a string (wc -w)? command for find & replace strings (in vi %s/find/replace/g)? kill all the java process with single command ? How to filter the output of a command? hw to ignore specific string from output (grep -v <string>)?