Chapter 16

Which of the following options for the useradd command allows root to specify supplementary groups the user will be a member of? -G -u -g -U

-G

The usermod command can be used to unlock a users account with the following option. -s -u -f -U

-U

Which of the following options for the useradd command allows you to use a different primary group then the default? -g -G -U -u

-g

Which option for the usermod command can be used to specify a user's primary group ID? -g -S -G -s

-g

Which option for the usermod command can be used to specify a user's group ID (either primary or secondary)? (choose two) -s -g -S -G

-g -G

Which of the following options for the useradd command allows you to use a different login shell than the default? -g -s -u -U

-s

Which of the following files contains encrypted user password information? /etc/usr /etc/group /etc/passwd /etc/shadow

/etc/shadow

UIDs 1-499 are usually reserved for what kind of users? Remote log-in accounts Are not used for user accounts, but for group accounts System accounts, such as server processes Log-in (human) users

System accounts, such as server processes

GIDs under 500 (or 1000) are usually reserved for what kind of groups? System use Are not used for groups, but for user accounts Administrators User private groups (UPG)

System use

The groupmod command can be used to change a group GID. True or False?

True

Which command can be used to determine a user's most recent log in? history last login shell

last

Which command can be used to determine a user's most recent log in? history shell login last

last

Which command allows you to view or change some of the default values used by the useradd command? useradd -D useradd -r modvalue useradd -f

useradd -D

Which of the following commands can be used to modify a user? adduser moduser useradd usermod

usermod

Which of the following commands, run as root, will prevent the user bob from logging in? usermod -L bob usermod -l bob usermod -D bob usermod -d bob

usermod -L bob

Which of the following commands, run as root, will prevent the user jane from logging in? usermod -d jane usermod -D jane usermod -L jane usermod -l jane

usermod -L jane

Which of the following commands will add the group extra to the user bob's secondary groups in addition to bob's current secondary groups? usermod -G extra bob usermod -ag bob extra usermod -aG extra bob usermod -a extra bob

usermod -aG extra bob

Which of the following options for the useradd command allows root to specify the UID to be associated with the account? -g -G -u -M

-u

The userdel -r command will... ...will prompt before deleting each file owned by a user. ...delete the user account, but leave the user's files by default. ...automatically delete a user and the user's home directory and mail spool and their contents. ...automatically delete a user and all the files owned by that user.

...automatically delete a user and the user's home directory and mail spool and their contents.

If a user is deleted, the files and directories that the user owned... ...are deleted as well. ...will have no user owner. ...may be important for others in the organization ...will have no UID owner.

...may be important for others in the organization

If a user is deleted, the files and directories that the user owned... ...will have no user owner. ...will have no UID owner. ...will show a UID as the owner, but not user name. ...are deleted as well.

...will show a UID as the owner, but not user name.

Which of the following files contains group IDs? /etc/passwd /etc/usr /etc/shadow /etc/group

/etc/group

Which of the following files does the groupadd command use to determine the new GID when a GID isn't specified? /etc/usr /etc/shadow /etc/passwd /etc/group

/etc/group

Which of the following files contains user IDs? /etc/group /etc/passwd /etc/usr /etc/shadow

/etc/passwd

What directory contains a user's home directory? /user / /home /rootfs

/home

For root users, the passwd command can only be used to change the password of the user running the command. True or False?

False

On a system that does not use UPG, the useradd command will also create a user group. For example, user bob, group bob. True or False?

False

On a system that uses UPG, the UID must not be the same as the GID.. True or False?

False

The /etc/passwd file contains encrypted user password information. True or False?

False

The groupdel command can be used to delete primary groups. True or False?

False

The groupmod command can be used to add users to a group. True or False?

False

The groupmod command cannot be used to change a group GID. True or False?

False

For non-root users, the passwd command can only be used to change the password of the user running the command. True or False?

True

The groupmod command can be used to change a group name. True or False?

True

Which of the following commands can be used to modify a group? groupmod groupadd modgroup addgroup

groupmod

Which of the following commands will add the group extra to the user jane's secondary groups in addition to jane's current secondary groups? usermod -a extra jane usermod -ag jane extra usermod -aG extra jane usermod -G extra jane

usermod -ag jane extra