103.1 Command Line (Env Vars, Displays)

Question 1

env variables

shortcuts with easy to use and remember designation that allow you to indicate
paths
commands
aliases
other info

Answer 1

env variables

Question 2

env variables

command to list all env vars set for the current session EXCEPT for shell settings

Answer 2

env

Question 3

set

used to view any shell settings or shell variables for the session

Answer 3

set

Question 4

shopt

used to view any shell settings or shell variables for the session

Answer 4

shopt

Question 5

PATH

env var containing a colon separated listing of directories that are searched - in order for command executable files

Answer 5

PATH

Question 6

PATH

absolute path

Answer 6

/home/user/command

Question 7

PATH

env var is set for the system here

Answer 7

/etc/profile

Question 8

PATH

can be modified on command line or any other executable sourced script

Answer 8

/home/user/.bashrc

Question 9

HISTFILE

command uses this value to display a list of previously run commands

Answer 9

history

Question 10

HISTFILE

by default the value for any user will be

Answer 10

/home/user/.bash_history

Question 11

HISTFILE

index of current command

Answer 11

HISTCMD

Question 12

HISTFILE

when set to ignorespace any command preceeded by blank space with NOT be recorded in history file

Answer 12

HISTCONTROL

Question 13

HISTFILE

number of lines that can be used to hold previous commands

default == 500

Answer 13

HISTFILESIZE

Question 14

env var change

overwrite

Answer 14

Overwrite export VARIABLE=newValue

Question 15

env var change

append

Answer 15

Append

export VARIABLE=$VARIABLE:newValue