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INTERVIEW QUESTIONS OPERATING SYSTEMS LINUX DETAILS

Question: In order to improve your system's security you decide to implement shadow passwords. What command should you use?

Answer: Answer: pwconv

The pwconv command creates the file /etc/shadow and changes all passwords to 'x' in the /etc/passwd file.

Category Linux Interview Questions & Answers - Exam Mode / Learning Mode
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Question: In order to improve your system's security you decide to implement shadow passwords. What command should you use?

Answer:

Answer: pwconv

The pwconv command creates the file /etc/shadow and changes all passwords to 'x' in the /etc/passwd file. Source: CoolInterview.com


/etc/passwd file already exists there..
so. give passwords by "passwd "
Source: CoolInterview.com

Answered by: ghanish | Date: 9/27/2009 | Contact ghanish Contact ghanish


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Related Questions
View Answer
When looking at the /etc/passwd file, you notice that all the password fields contain 'x'. What does this mean?
Choose one:

a. That the password is encrypted.
b. That you are using shadow passwords.
c. That all passwords are blank.
d. That all passwords have expired.
View Answer
When you look at the /etc/group file you see the group kmem listed. Since it does not own any files and no one is using it as a default group, can you delete this group?
View Answer
You need to delete the group dataproject. Which two of the following tasks should you do first before deleting the group?

A. Check the /etc/passwd file to make sure no one has this group as his default group.
B. Change the members of the dataproject group to another group besides users.
C. Make sure that the members listed in the /etc/group file are given new login names.
D. Verify that no file or directory has this group listed as its owner.

Choose one:

a. A and C
b. A and D
c. B and C
d. B and D
View Answer
You changed the GID of the sales group by editing the /etc/group file. All of the members can change to the group without any problem except for Joe. He cannot even login to the system. What is the problem?
Choose one:

a. Joe forgot the password for the group.
b. You need to add Joe to the group again.
c. Joe had the original GID specified as his default group in the /etc/passwd file.
d. You need to delete Joe's account and recreate it.
View Answer
What command is used to remove the password assigned to a group?
View Answer
You need to create a new group called sales with Bob, Mary and Joe as members. Which of the following would accomplish this?
Choose one:

a. Add the following line to the /etc/group file: sales:44:bob,mary,joe
b. Issue the command groupadd sales.
c. Issue the command groupadd -a sales bob,mary,joe
d. Add the following line to the /etc/group file: sales::44:bob,mary,joe
View Answer
All groups are defined in the /etc/group file. Each entry contains four fields in the following order.
Choose one:

a. groupname, password, GID, member list
b. GID, groupname, password, member list
c. groupname, GID, password, member list
d. GID, member list, groupname, password
View Answer
After bob leaves the company you issue the command userdel bob. Although his entry in the /etc/passwd file has been deleted, his home directory is still there. What command could you have used to make sure that his home directory was also deleted?
Choose one:

a. userdel -m bob
b. userdel -u bob
c. userdel -l bob
d. userdel -r bob
View Answer
Mary has recently gotten married and wants to change her username from mstone to mknight. Which of the following commands should you run to accomplish this?
Choose one:

a. usermod -l mknight mstone
b. usermod -l mstone mknight
c. usermod -u mknight mstone
d. usermod -u mstone mknight
View Answer
You have created special configuration files that you want copied to each user's home directories when creating new user accounts. You copy the files to /etc/skel. Which of the following commands will make this happen?
Choose one:

a. useradd -m username
b. useradd -mk username
c. useradd -k username
d. useradd -Dk username
View Answer
You issue the following command useradd -m bobm But the user cannot logon. What is the problem?
Choose one:

a. You need to assign a password to bobm's account using the passwd command.
b. You need to create bobm's home directory and set the appropriate permissions.
c. You need to edit the /etc/passwd file and assign a shell for bobm's account.
d. The username must be at least five characters long.
View Answer
When using useradd to create a new user account, which of the following tasks is not done automatically.
Choose one:

a. Assign a UID.
b. Assign a default shell.
c. Create the user's home directory.
d. Define the user's home directory.
View Answer
You create a new user by adding the following line to the /etc/passwd file
bobm::501:501:Bob Morris:/home/bobm:/bin/bash
You then create the user's home directory and use the passwd command to set his password. However, the user calls you and says that he cannot log on. What is the problem?

Choose one:
a. The user did not change his password.
b. bobm does not have permission to /home/bobm.
c. The user did not type his username in all caps.
d. You cannot leave the password field blank when creating a new user.
View Answer
Which of the following tasks is not necessary when creating a new user by editing the /etc/passwd file?

Choose one:
a. Create a link from the user's home directory to the shell the user will use.
b. Create the user's home directory
c. Use the passwd command to assign a password to the account.
d. Add the user to the specified group.
View Answer
You create a new user account by adding the following line to your /etc/passwd file.
bobm:baddog:501:501:Bob Morris:/home/bobm:/bin/bash
Bob calls you and tells you that he cannot logon. You verify that he is using the correct username and password. What is the problem?
Choose one:

a. The UID and GID cannot be identical.
b. You cannot have spaces in the line unless they are surrounded with double quotes.
c. You cannot directly enter the password; rather you have to use the passwd command to assign a password to the user.
d. The username is too short, it must be at least six characters long.
View Answer
You attempt to use shadow passwords but are unsuccessful. What characteristic of the /etc/passwd file may cause this?

Choose one:
a. The login command is missing.
b. The username is too long.
c. The password field is blank.
d. The password field is prefaced by an asterick.
View Answer

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