Which command is used to add an empty group to the system? (Specify ONLY the command without any path or parameters.)

Which commands can be used to change a user's account aging information? (Choose THREE correct answers.) A. usermod B. passwd C. chattr D. chage E. chsh

In which file, if present, must all users be listed that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)

Which of the following commands should be added to /etc/bash_profile in order to change the language of messages for an internationalized program to Portuguese (pt)? A. export LANGUAGE="pt" B. export...

Which of the following files assigns a user to its primary group? A. /etc/pgroup B. /etc/shadow C. /etc/group D. /etc/passwd E. /etc/gshadow

Which of the following crontab entries will execute myscript at 30 minutes past every hour on Sundays? A. 0 * * * 30 myscript B. 30 * * * 6 myscript C. 30 0 * * 0 myscript D. 30 0-23 * * 0 myscript E...

To prevent a specific user from scheduling tasks with at, what should the administrator do? A. Add the specific user to /etc/at.allow file. B. Add the specific user to [deny] section in the /etc/atd....

Each entry in a crontab must end with what character? A. Tab B. Space C. Backslash D. Newline

Which environment variable should be set in order to change the time zone for the commands run from within the environment variable's scope? (Specify the variable name only.)

Which file contains the date of the last change of a user's password? A. /etc/gshadow B. /etc/passwd C. /etc/pwdlog D. /etc/shadow E. /var/log/shadow