The agency that sits between the user and the UNIX system is called the

Which of the following commands is used to update access and modification times of a file?

Which command is used to count just the number of characters in a file?

Which of the following commands is used to list contents of directories?

Which command will be used with vi editor to insert text to left of cursor?

Which of the following special shell variables is used to process number of the last background job?

Which option will be used with ps command to slow the entire command line of the process being run?

Which of the following command addresses all users who are currently hooked on?