What are the different data types in perl? How do you execute your perl script? What are basic steps for writing your own perl module? If you have a Hash with keys and you want to remove any spaces in the keys, how would you do it? Difference between use and require? What will happen if i open a file from perl script and forget to close it, and then try to open it again? How do you handle runtime exceptions in perl? How do you run a sql query from perl script? How can you print all unique tags present in a html file from a perl script? trying to transpose a matrix is faster in perl or C? why? what is my, our and local? If there are Variables declared with my in a module, will same variable be available in a perl script where i call use for that module? Can you write multiple modules in the same pm file? How can you run a unix command from perl script? - system command What is the return value of system command? What if you want to run a unix command from perl script and want to get the results back? How to check if a certain key is there in a certain given hash? -exists() Does exists work on array? How do you check if a certain value is present in the array? What do you do if your script throws an error that a certain module is not found in @INC? What are commands you use on unix/linux in day to day work? How can you list all txt files from a directory? How can you list all txt files in a directory and subdirectories? How to change the date time stamp of a file? How can you list all files containing a certain word? How can you list all files not containing a certain word? How will you display line number 10 to 20 of a file? How do you give permissions for a executable file? How is data for Tables stored in the database? Write a sql query to fetch employee id, employee name, manager id, manager name from a table containing employee id, employee name , manager id.