3-Configurig Bash Shell

Question 1

is a name or identifier that can e assignment a value

Answer 1

variable

Question 2

how to declare a local variable:

Answer 2

varname=”value”

Question 3

is a variable that is only available to the shell in which it was created.

Answer 3

local variable

Question 4

is available to the shell in which it was created, and it is passed into all other commands/programs started by the shell.

Answer 4

environment variable

Question 5

how to print a local variable:

Answer 5

echo $varname

Question 6

how to declare an environment variable:

Answer 6

export VARNAME=”value”

note: variable name should be in caps

Question 7

how to print an environment variable:

Answer 7

echo $VARNAME

Question 8

If you create a variable and then no longer want that variable to be defined, use the _______ command to delete it

Answer 8

unset

example:
unset VARIABLE

(no output will be displayed)

Question 9

The _______ variable is one of the most critical environment variables for the shell, so it is important to understand the effect it has on how commands will be executed.

Answer 9

PATH

Question 10

The _______ variable contains a list of directories that are used to search for commands entered by
the user.

Answer 10

PATH

Question 11

specifies the location of a file or directory from the top-level directory through all of the subdirectories to the file or directory.

Answer 11

absolute path

Question 12

always start with the / character representing the root directory. For example, /usr/bin/ls

Answer 12

absolute path

Question 13

[skee@localhost ~]$ /home/skee/welcome.sh

The example above is a _______ path

Answer 13

absolute

Question 14

specifies the location of a file or directory relative to the current directory. For example, in the /home/sysadmin directory, a relative path of test/newfile would actually refer to the /home/sysadmin/test/newfile file.

Answer 14

relative path

Question 15

[skee@localhost ~]$ ./welcome.sh

The example above is a _______ path

Answer 15

relative

Question 16

requires administrative access to the system as the files under the /etc directory can only be modified by an administrator. A user can only modify the initialization files in their home directory.

Answer 16

Modifying global configuration

Question 17

is a special character to the Bash shell to indicate the execution of a command within the history list. T

Answer 17

! exclamation mark

Question 18

To clear the entire contents of the history file,

execute _______

Answer 18

history -c