Basic Shell Scripting

1. First Script

2. Run Basic Tasks

3. Run Basic Administration Tasks

4. Defining Variables

5. Input=Output

6. Conditional/If else statements

7. Case Statements

8. For loop script

9. do-while

10. Getting Online help

#!/bin/bash
# Author: Shounak Khulape
# Date Created: 02/23/2024
# Description:    This script will output "Hello World" on the screen
# Date Modified: 02/23/2024
echo
echo Hello World
echo

Basic Tasks Script

• Create 2nd script to run basic tasks

  • pwd

  • ls

  • whoami

  • date

  • cal

  • touch a b c

Basic Administration Tasks

• Create a script to run basic administration tasks

  • top

  • df -h

  • free -m

  • uptime

  • iostat

Defining Variables

• Create script to run basic tasks

  • p=pwd

  • l=ls

  • w=whoami

  • d=date

  • c='cal 2018'

Input/output

• Create script to take input from the user

  • read

  • echo

Conditional/If else statements

if-then statement

• If then statement

  • If this happens = do this

  • Otherwise = do that

Case Statement Scripts

• Case

  • If option a is selected = do this.

  • If option b is selected = do this.

  • If option c is selected = do this.

For Loop Scripts

• For Loops

  • Keep running until specified number of variable

  • eg: variable = 10 the run the script 10 times

  • variable = green, blue, red (then run the script 3 times for each color.)

#!/bin/bash
# Author: Shounak Khulape
# Date Created: 02/23/2023
# Description: This script will run basic admin command
# Date Modified: 02/23/2024
echo
echo This script will run basic administrative commands
echo
top
echo
df -h
echo
uptime
echo
iostat
echo
echo End of Script

#!/bin/bash
# Author: Shounak Khulape
# Date Created:    02/23/2024
# Description: Run Basic linux tasks
# Date Modified: 02/23/2024

echo
echo This script will run a few basic tasks
echo
pwd
ls
whoami
date
cal
touch a b c

#!/bin/bash
# Author: Shounak Khulape
# Date Created: 02/23/2024
# Description: This script is to check if a file error exit
# Date Modified: 02/23/2024
echo
clear
if [ -e /home/oracle/error.txt ]
then
    echo "File exist"
else
    echo "File does not exist"
fi

#!/bin/bash
# Date Created: 02/23/2024
# Author: Shounak Khulape
# Description: This script is regarding if-then command
# Date Modified: 02/23/2024

count=100
if [ $count -eq 100 ]
then
    echo Count is 100
else
    echo Count is not 100
fi

#!/bin/bash
# Author: Shounak Khulape
# Date Created: 02/23/2023
# Description: This script is created to dispaly input/output command.
# Date Modified: 02/23/2024
a=`hostname`
echo
echo Hello, my server name is $a
echo
echo Hello, My Name is Shounak Khulape
echo
echo What is your name?
read namecont
echo
echo Hello $namecont
echo

#!/bin/bash
# Date Created: 02/26/2024
# Author: Shounak Khulape
# Description: This script check the response and then output
# Date Modified: 02/26/2024
echo
clear
echo
echo "What is your name?"
echo
read a
echo

echo Hello $a sir
echo

echo "Do you like working in IT? (y/n)"
read like
echo

if [ "$like" == y ]
then
    echo You are cool
elif [ "$like" == n ]
then
    echo "You Should try IT, it's a good field"
echo
fi

#!/bin/bash
# Author: Shounak Khulape
# Date Created: 02/23/2024
# Description: This script is screated for declaring varaiable command
# Date Modified: 02/23/2024
echo
# Define Variables
p=pwd
l=ls
wi=whoami
d=date
c="cal 2018"

echo Run variables tasks
echo
$p
$l
$wi
$d
$c

That's great if you have make till here you have covered Basic Shell Standards.

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Thank you and Happy Learning!👏