1. Which command permits to schedule jobs for later execution, as soon as the system load permits?
Correct Answer is : batch
2. Jobs scheduled using batch command goes to a special at queue.
3. Jobs scheduled using batch command can be removed using ___ option.
4. What is a daemon?
Correct Answer is : process which runs automatically without any user interaction
5. What is cron?
Correct Answer is : a daemon
6. The cron tab is a table having a list of commands that are scheduled to be run at regular intervals.
7. Which of the following command will remove the current crontab?
Correct Answer is : crontab -r
8. To find out how efficiently a program a used the system resources, which command is used?
9. Which command shows some attributes of a process?
10. Which of the following attribute is not shown by ps command?
11. Which option is used by ps command to get a detailed listing of process attributes?
12. Which option is used by the system administrator for displaying processes of a user?
13. The -a option when used with ps command lists processes of all users but doesn’t display the system processes.
14. Which option is used with ps command to list system processes?
Correct Answer is : –A and -e
15. What will the output of the following command?
$ ps -t dev/console
Correct Answer is : processes running on terminal named console
16. There are ___ distinct phases of a process.
17. A system call is a programmatic way in which the program requests for the service from the kernel of an operating system.
18. Which of the following system call is used for creating a new process?
19. When fork() is invoked, the child process created gets a new PID.
20. What is the value returned by fork system call, when the creation of child process is unsuccessful?
Correct Answer is : negative integer