Process and Task Scheduling Review Questions

Q. The default location to send application error messages is the system log file. True or False? A. False. The default location is the user screen where the program is initiated.

Q. What are the five process states? A. The five process states are running, sleeping, waiting, stopped, and zombie.

Q. Signal 9 is used for a hard termination of a process. True or False? A. True.

Q. You must restart the crond service after modifying the /etc/crontab file. True or False? A. False. The crond daemon does not need a restart after a crontable is modified.

Q. What are the background service processes normally referred to in Linux? A. The background service processes are referred to as daemons.

Q. What is the default nice value? A. The default nice value is zero.

Q. The parent process gets the nice value of its child process. True or False? A. False. The child process inherits its parent’s niceness.

Q. When would the cron daemon execute a job that is submitted as */10 * 2-6 6 * /home/user1/script1.sh? A. The cron daemon will run the script every tenth minute past the hour on the 2nd, 3rd, 4th, 5th, and 6th day of every sixth month.

Q. What is the other command besides ps to view running processes? A. The top command.

Q. Every process that runs on the system has a unique identifier called UID. True or False? A. False. It is called the PID.

Q. Why would you use the renice command? A. The renice command is used to change the niceness of a running process.

Q. What are the two commands to list the PID of a specific process? A. The pidof and pgrep commands.

Q. By default the *.allow files exist. True or False? A. False. By default, the *.deny files exist.

Q. Where do the scheduling daemons store log information of executed jobs? A. The scheduling daemons store log information of executed jobs in the /var/log/cron file.

Q. Which user does not have to be explicitly defined in either *.allow or *.deny file to run the at and cron jobs? A. The root user.

Q. When would the at command execute a job that is submitted as at 01:00 12/12/2020? A. The at command will run it at 1am on December 12, 2020.

Q. What are the two commands that you can use to terminate a process? A. The kill and pkill commands.

Q. What is the directory location where user crontab files are stored? A. The user crontab files are stored in the /var/spool/cron directory.

Q. What would the nice command display without any options or arguments? A. The nice command displays the default nice value when executed without any options.

Q. Which command can be used to edit crontables? A. You can use the crontab command with the -e option to edit crontables.