Which option is used to check if a file exists or not?

Which of the following symbols are used in a relative pathname?

To delete all files in a directory we use ______________ 

Every process is identified by a unique integer called the ______

Which of the following is not an internal command used by the mailx email client?

Which shell parameter is used for storing the number of positional parameters?

Which option is used with ls command to list the directory attributes rather than its contents? 

-v option is used with cp command for displaying _____ 

Which command would be most suitable to remove the following directories?

dira dirb dirc dird

Which Linux command is used for monitoring system input/output statistics for devices and partitions?