ADV *NIX DAY 4

Question 1

A variable and its value are displayed using echo $variable.

Answer 1

echo

Question 2

Displays existing shell variables, environmental variables and shell functions.

Answer 2

set

Question 3

Make a shell variable available with newly forked child processes, for that session only.

Answer 3

export

Question 4

Display existing environmental variables.

Answer 4

env

Question 5

Read and execute commands from filename in the current shell environment.

Answer 5

source

Question 6

Run a shell with substitute user and group IDs.

Answer 6

su

Question 7

OpenSSH, an SSH client for logging and executing commands on a remote machine. Provides secure encrypted communications between two untrusted hosts over an insecure network.

Answer 7

ssh

Question 8

Secure copy (remote file copy program)uses SSH for data transfer. Also uses the same authentication and provides the same security as SSH.

Answer 8

scp

Question 9

Secure file transfer program. An interactive file transfer program, similar to FTP, which performs all operations over an encrypted SSH transport.

Answer 9

sftp

Question 10

Change your login shell or list available shells on the system.

Answer 10

chsh

Question 11

Create a new group account using specified values and default system values.

Answer 11

groupadd

Question 12

Change the current group ID during a login session.

Answer 12

newgrp

Question 13

Create a new user or update default new user information.

Answer 13

useradd

Question 14

Update authentication tokens (aging info), to include changing password for a user.

Answer 14

passwd

Question 15

Change or list user password expiry information.

Answer 15

chage

Question 16

Modify an existing user account.

Answer 16

usermod

Question 17

Delete a user.

userdel –rf Deletes a user, their home directory and its contents.

Answer 17

userdel

Question 18

Password sync utility. Convert information in /etc/passwd to /etc/shadow.

Answer 18

pwconv

Question 19

Print real and effective user and group IDs.

Answer 19

id

Question 20

System wide environment and startup programs.

Answer 20

/etc/profile

Question 21

User specific environment and startup programs.

Answer 21

~/.bash_profile

Question 22

User specific aliases and functions.

Answer 22

~/.bashrc

Question 23

System wide aliases and functions.

Answer 23

/etc/bashrc

Question 24

Used for authentication and authorization, contains user account information.

Answer 24

/etc/passwd

Question 25

Used for authentication, contains hashed password and aging information for user accounts.

Answer 25

/etc/shadow

Question 26

Defines the site-specific configuration for the shadow password suite, encryption method used.

Answer 26

/etc/login.defs

Question 27

Used for authorization, contains a listing of every group on the system and is where supplemental group membership is maintained.

Answer 27

/etc/group