IT 116: Introduction to Scripting

IT 116: Introduction to Scripting
Class 5 Exercise

Log in to users3

Run an SSH client
Run putty.exe if you have a PC or Terminal if you have a Mac.
Enter your password

Create a directory for this exercise

Go to your home directory
```
cd
```
Go to your it116 directory
```
cd  it116
```
Go to your ex directory
```
cd ex
```
Make sure you are in your ex directory
```
pwd
```
If you are not in /home/UNIX_ID/it116/ex, see me.
Create a directory for this exercise
```
mkdir  ex5
```
Check that the directory was created
```
ls
```
Go to this new directory
```
cd ex5
```

Practice with interactive mode

Enter Python interactive mode
```
python3
```
Create three variables
```
>>> a = 4
>>> b = 5
>>> c = 6
```
Print the values of the variables you just created
```
>>> (4, 5, 6)
```
Notice that you can print more than one variable at a time.
Perform some calculations using addition and subtraction
```
>>> a + b + c
>>> a + b - c
>>> b - c - a
```
Perform some calculations using the division and remainder operators
```
>>> c / a
>>> c // a
>>> c % a
```
Notice the difference between the two different types of division.
Perform some operations using the exponent operator
```
>>> a ** 2
>>> a ** 3
>>> a ** 4
```

Perform some calculations involving operator precedence

>>> a + b * c
>>> (a + b) * c
>>> a + b / c
>>> a + b // c
>>> a + b % c
>>> (a + b) / c
>>> (a + b) // c
>>> (a + b) % c

Quit interactive mode

Control D

Script for this Exercise

Create the script ex5.py
```
nano  ex5.py
```
Enter the following text into the script file

Run this script
```
python3  ex5.py
```

You should see

a: 4 b: 5 c: 6

a + b + c = 15
a + b - c = 3
b - c - a = -5

c / a  = 1.5
c // a = 1
c % a  = 2

a ** 2 = 16
a ** 3 = 64
a ** 4 = 256

a + b * c    = 34
(a + b) * c  = 54
a + b / c    = 4.833333333333333
a + b // c   = 4
a + b % c    = 9
(a + b) / c  = 1.5
(a + b) // c = 1
(a + b) % c  = 3

Running my test script on your script

If you want to run my text script on your Class Exercise script do the following
Run ex05.sh on your script
```
~ghoffman/it116_test/ex05.sh
```
The script will prompt you for your Unix username.