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Saturday, 12 September 2020

Bash Scripting Get a user input





In Linux, all tasks from execution of services to loading and unloading of modules are carried out by programs and all programs need to be executed. You use the commands to access all the basic features of kernel. Shell scripting is a way to automate such tasks, and bash is one of the language, that has capabilities enough to be called as scripting as well as a language that can be used for programming on the POSIX platform, for small tasks.  Bash Scripting Get a user input



Get User Input:



‘read’ command is used to take input from user in bash. Create a file named ‘user_input.sh’ and add the following script for taking input from the user. Here, one string value will be taken from the user and display the value by combining other string value.


#!/bin/bash

echo "Enter Your Name"
read name
echo "Welcome $name to HackingTruth"




Run the file with bash command.

$ bash user_input.sh






OR

#!/bin/bash

clear

echo

#echo enter your name :

#read name

read -p  "Enter your name : "  name

echo "Hi $name"

echo "!How are you today"

# sleep for wait a time 5 seconds

sleep 3

echo "Enter your friend name : "

read namee

echo "I am fine $namee"

 

 

Example-2: Using read command with options



-p option is used with read command to display some helpful message for the user related to input. -s option is used to hide the text from the terminal which will be typed by the user. This is called silent mode and used for password data. The following example shows the use of both options.



#!/bin/bash

# Type your Login Information
read -p 'Username: ' user
read -sp 'Password: ' pass

if (( $user == "admin" && $pass == "12345" ))
then
     echo -e "\nSuccessful login"
else
     echo -e "\nUnsuccessful login"
fi



Run the file with bash command.

$ bash user_input2.sh




Example-3: Using read command to take multiple inputs



If you want to take multiple inputs at a time then you have to use read command with multiple variable names. In the following example, four inputs are taken in four variables by using read command.


#!/bin/bash

# Taking multiple inputs
echo "Type four names of your favorite programming languages"
read lan1 lan2 lan3 lan4
echo "$lan1 is your first choice"
echo "$lan2 is your second choice"
echo "$lan3 is your third choice"
echo "$lan4 is your fourth choice"



Run the file with bash command.

$ bash user_input3.sh








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- Hacking Truth by Kumar Atul Jaiswal




My Self Kumar Atul Jaiswal Urf HackerboY and Kumar Atul Jaiswal is a name among millions who struggled failed and surged ahead in search of how to become a Hacker ( passionate about Hacking just like profession an entrepreneur ), just like any middle class guy, he too had a bunch of unclear dreams and a blurred version of his goals in life 😊.

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