Variables

Question 1

how do you write a function?

Answer 1

name () {
commands
return
}

Question 2

What is top down design?

Answer 2

Process of identifying top-level steps and developing increasing detailed views of those steps.

Question 3

Shell functions are:

Answer 3

“Mini-scripts” located inside other scripts and can as as autonomous programs.

Question 4

how do you start every script:

Answer 4

!/bin/bash

Question 5

Run a script with what cmds:

Answer 5

./

Question 6

How are variables written:

Answer 6

variable=value

Question 7

a=z

Answer 7

Assign the string “z” to variable a.

Question 8

b=”a string”

Answer 8

Embedded spaces must be within quotes

Question 9

c=”a sting and $b”

Answer 9

Other expressions such variables can be expanded into a variable

Question 10

d=”$(ls -l foo.txt)”

Answer 10

Variable is the result of the cmd

Question 11

e=$((5 * 7))

Answer 11

Arithmetic expression

Question 12

f=”\t\ta string\n”

Answer 12

Escape sequence such as tabs and new lines.

Question 13

Variable result of: 
filename="myfile" 
#mv "$filename" "${filename}1"

Answer 13

myfile1

Question 14

Quoting in variables:

Answer 14

Good practice to enclose variables and cmd substitutions in double quotes to limit the effects of word-splitting by the shell.