Ch.3 Working with the linux shell

Question 1

command to check current locale settings

Answer 1

localectl

Question 2

command to set an environment variable

Answer 2

• export variable_name=value
• <variable_name>=<value>;export
  </value></variable_name>

Question 3

command to set system clock to a specific timezone

Answer 3

timedatectl set-timezone “timezone”

Question 4

command used for reporting information from and managing the system clock

Answer 4

date

Question 5

date %

Answer 5

%D or %m/%d/%y

Question 6

Full date %

Answer 6

%F or %Y-%m-%d

Question 7

Full weekday name %

Answer 7

%A

Question 8

Locale category for telephone number format

Answer 8

LC_TELEPHONE

Question 9

locale category for address format

Answer 9

LC_ADDRESS

Question 10

Locale category for how characters are compared and sorted

Answer 10

LC_COLLATE

Question 11

Nanosecond %

Answer 11

%N

Question 12

What can cause attempting to set the time with timedatectl command to not work?

Answer 12

If the environment is using NTP

Question 13

What clocks does a linux OS use?

Answer 13

Hardware clock or real-time clock (RTC)
and
System clock

Question 14

What defines settings that remain persistent even after logging off or rebooting?

Answer 14

Configuration files

Question 15

When looking at a variables properties, what does -x indicate?

Answer 15

signifies that it is an environment variable

Question 16

Which variable is visable to child processes?

Answer 16

environment variable

Question 17

Which variable only exists in memory spaces of the shell it was created in?

Answer 17

shell variable

Question 18

command format to print specifics about time and date

Answer 18

date +%

Question 19

command that displays a list of all environment variables in the current shell

Answer 19

env

Question 20

command that displays a list of shell variables and functions in the current process

Answer 20

set

Question 21

command that displays a variables properties

Answer 21

declare -p <variable>;</variable>

Question 22

command to delete a variable and remove it form the environment

Answer 22

unset

Question 23

command to convert existing shell variables to environment variables

Answer 23

export <variable_name>;</variable_name>

Question 24

command to list available timezones to set the system clock to

Answer 24

timedatectl list-timezones

Question 25

command to list locality

Answer 25

localectl list-locals

Question 26

command to manage the (RTC) real-time clock

Answer 26

hwclock

Question 27

command to set date and time

Answer 27

date -s

Question 28

command to set system clock to hardware clock

Answer 28

hwclock -w hwclock --systohc

Question 29

command to set system time

Answer 29

timedatectl set-time 'HH:MM:SS'

Question 30

command to set system time using the RTC

Answer 30

hwclock -s or hwclock --hctosys

Question 31

command to verify changes within /etc/local.conf

Answer 31

localectl status

Question 32

command to view directory permissions instead of file permissions

Answer 32

ls -ld

Question 33

command used to view and manage system clocks

Answer 33

timedatectl

Question 34

command used to view and modify system locale and keyboard settings

Answer 34

localectl

Question 35

command used to define output formats used by applications depending on the location of the linux computer

Answer 35

locale

Question 36

date representation %

Answer 36

%x

Question 37

day of the month %

Answer 37

%d

Question 38

day of the year %

Answer 38

%j

Question 39

locale category for local code

Answer 39

LC_IDENTIFICATION

Question 40

locale category for measure format

Answer 40

LC_MEASUREMENT

Question 41

locale category for money format

Answer 41

LC_MONETARY

Question 42

locale category for paper sizes

Answer 42

LC_PAPER

Question 43

term to describe a parent process creating a child process

Answer 43

spawn

Question 44

what file do localectl changes go to?

Answer 44

/etc/locale.conf

Question 45

configuration changes are not active until?

Answer 45

They are stored in memory or sourced

Question 46

Files ending in .csh are sourced when using?

Answer 46

C-shell

Question 47

files ending in .sh are sourced when using which shells?

Answer 47

bourne, korn, or bash

Question 48

list of bash config files

Answer 48

/etc/profile /etc/bashrc /home//.bash_profile /home//.bashrc /home//.bash_logout

Question 49

scripts in the directory /etc/profile.d are read or sourced when?

Answer 49

during the login process

Question 50

The shell parameter noclobber does not allow

Answer 50

> (stdout) to overwrite an existing file

Question 51

to place changes in memory, the user must

Answer 51

execute the commands in the configuration file

Question 52

used to configure bash shell features

Answer 52

/etc/bashrc /home//.bashrc

Question 53

what are the stdout operators and what do they do?

Answer 53

> redirect stdout to a file (writes over file) >> redirect stdout to a file (appends the file)

Question 54

what command executes the commands in a configuration file?

Answer 54

source .

Question 55

what does ~ represent?

Answer 55

the home directory

Question 56

What operator is here string and what does it allow the user to do?

Answer 56

<<< Allows a user to send a string to a command

Question 57

What settings will you find in file /home//.bash_profile?

Answer 57

default editor settings ex. EDITOR=/usr/bin/nano Path - search path of directories where executable programs can be found

Question 58

When a user logs into a system, customization scripts are read in the following order when using bash shell

Answer 58

1. /etc/profile 2. /home//.bash_profile 3. /home//.bashrc 4. /etc/bashrc

Question 59

When is /etc/bashrc read? What settings can you find?

Answer 59

read when a pseudo-terminal starts Shell - command shell for this session. ex. /bin/bash PS1 - the command prompt config

Question 60

When is the /etc/profile read and what environment variables might you see?

Answer 60

once at login. Hostname of computer or node Mail - file where a user receiving mail resides

Question 61

operator to combine stdout and stderr

Answer 61

2>&1 or &>

Question 62

system-wide bash configuration files

Answer 62

/etc/profile /etc/bashrc

Question 63

used to perform operations during logout

Answer 63

/home//.bash_logout

Question 64

what defines settings that remain persistent even after logging off or booting?

Answer 64

configuration files

Question 65

What is the operators for stderr?

Answer 65

2> chooses an alternate stderr file 2>> creates a new stderr file if it does not exist or appends the file