11 Bash Script Examples

Bash Script Examples

Let’s have a look into some of the amazing bash scrip examples that  can be handy for you. Bash scripts are normally used for executing a shell command or running multiple commands together and also for the automation of the work. Let’s have a look into the some of the common bash script examples.

Bash Script Examples

1. Hello World Bash Script

Open any editor to create a bash file with the filename  ‘Firstexample.sh’.

nano Firstexample.sh

Add the following bash script to the file and save the file.

#!/bin/bash
echo "Hello World"

 

2. Echo Bash Script

Create a new bash file with a name, ‘echo_file.sh’ and add the following script.

#!/bin/bash
echo"Printing text along with newline"
echo -n "Printing text along without newline"
echo -e "\nRemoving \t backslash \t characters\n"

3. Using While Loop

Create a bash file with the name, ‘whileloopexample.sh’, to know the use of while loop.

#!/bin/bash
valid=true
count=1
while [ $valid ]
do
echo $count
if [ $count -eq 5 ];
then
break
fi
((count++))
done

4. Using For Loop:

Create a file named ‘forloop_example.sh’ and add the following script using for loop. Here, for loop will iterate for 20 times.

#!/bin/bash
for (( counter=20; counter>0; counter-- ))
do
echo -n "$counter "
done
printf "\n"

5. Get User Input:

Create a file named ‘userinput_file.sh’ and add the following script to take input from the user.

#!/bin/bash
echo "Enter Your Name"
read name
echo "Welcome $name to Linux Tutorial Blog By It'subuntu"

 

6. Using if statement:

Create a file named ‘simpleif_file.sh’.

#!/bin/bash
n=10
if [ $n -lt 10 ];
then
echo "It is one digit number"
else
echo "It is two digit number"
fi

7. Using if statement with AND logic:

Create a file named ‘if_with_AND_file.sh’ . In the following code, the ouput will be “valid users” if both values match, otherwise the output will be “invalid user”.

#!/bin/bash

echo "Enter username"
read username
echo "Enter password"
read password

if [[ ( $username == "admin" && $password == "password" ) ]]; then
echo "valid user"
else
echo "invalid user"
fi

 

8. Using if statement with OR logic:

Create a file named ‘if_with_OR.sh’ with the following code.

#!/bin/bash

echo "Enter any number"
read n

if [[ ( $n -eq 28 || $n -eq 99 ) ]]
then
echo "You have won the game"
else
echo "You have lost the game"
fi

9. Using Case Statement:

Create a new file named, ‘case_example.sh’.

#!/bin/bash

echo "Enter your lucky number"
read n
case $n in
101)
echo echo "You got 1st prize" ;;
510)
echo "You got 2nd prize" ;;
999)
echo "You got 3rd prize" ;;
*)
echo "Sorry, better try next time" ;;

 

10. Get Arguments from Command Line:

Create a file named “argcommand_line.sh” and add the following script.

#!/bin/bash
echo "Total arguments : $#"
echo "1st Argument = $1"
echo "2nd argument = $2"

 

11. Combine String variables:

Create a file named “string_combine.sh”.

#!/bin/bash

string1="Open"
string2="Source"
echo "$string1$string2"
string3=$string1+$string2
string3+=" is a good than closed source"
echo $string3

 

12. Add Two Numbers:

Create a file named ‘add_numbers.sh’ with the following code. Two integer values will be taken from the user and printed the result of addition.

#!/bin/bash
echo "Enter the first number"
read x
echo "Enter the second number"
read y
(( sum=x+y ))
echo "The result of addition=$sum"