Write a bash script by accepting two variables and perform four mathematical operation such as addition, subtraction, multiplication and division. On Operating system Linux
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Write a bash script by accepting two variables and perform four mathematical operation such as addition, subtraction, multiplication and division. On
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- linux !#bin/bash Backup Files Write a bash script to backup files. The script can take 0, 1 or 2 arguments. When there are 0 or more than 2 arguments, the script should print out the usage of the program on the screen. When there is 1 argument, the program should take the argument as source directory and backup all the files (not include directories) in the source directory. If the source directory does not exist, the program should print out the error message and the usage of the program on the screen. If the source directory exist, create a subdirectory inside source directory named ”backup-yyyy-mm-dd” and copy all the files in sourceHelp with Python coding issue The Linux operating system is a very popular server OS. A network administrator has to protect the login/password files stored on the servers. In Linux there are two important files: /etc/passwd And it contains rows that look like this: root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin user1:x:15:51:User One:/home/user1:nologin user2:x:15:51:User One:/home/user1:nologin user3:x:15:51:User One:/home/user1:nologin This file contains login information. It's a list of the server's accounts that has userID, groupID, home directory, shell and more info. And the second file /etc/shadow, contains rows that look like this: root:$1$TDQFedzX$.kv51AjM.FInu0lrH1dY30:15045:0:99999:7::: bin:*:14195:0:99999:7::: daemon:*:14195:0:99999:7::: adm:*:14195:0:99999:7::: ftp:*:14195:0:99999:7:::…3) Write a bash script using while loop that gets text input and displays it, and exits when text quit is typed
- please comment all code Using a Bash environment, write a script to do the following: - declare and initialize an array to a few numbers.- in a loop, validate the numbers so they are greater than 0, if so:- get the total of them then the average.- print the average value.Using C++ Comments are very helpful If header files are added please provide them The Caesar cipher is one of the earliest known and simplest ciphers. It is a type of substitution cipher in which each letter in the plaintext is 'shifted' a certain number of places down the alphabet. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z U V W X Y Z A B C D E F G H I J K L M N O P Q R S T H E L L O W O R L D Normal Text B Y F F I Q I R M X Encrypted Text You are tasked to create an encryption program which takes a key word. The keyword will fill the first part of the shifted array. The remaining letters will fill the end of the array. It should look like this: Key=”TOY A B C D E F G H I J K L M N O P Q R S T U V W X Y Z T O Y A B C D E F G H I J K L M N P Q R S U V W X Z You should have an interactive menu with the following options: 1…How to apply this python code? def encrypt_text(text, key): encrypted_text = '' # insert your code here # return encrypted_text text = input()key = input() print(encrypt_text(text, key))
- Use an encryption algorithm(DES, AES, etc.) to encrypt a file. Use programming language(C# user interface progamming) Make sure user: Can encrypt a photo Can encrypt a text file Can encrypt a rar file Can choose your own password Intuitive user interface (UI) Uses a hash as a password Uses self created encryption algorithm Removes unencrypted files after encryptionAn application loads 100 libraries at start-up. Loading each library requires exactly one disk access. The seek time of the disk to a random location is given as 10 ms. Rotational speed of disk is 6000 rpm. If all 100 libraries are loaded from random locations on the disk, how long does it take to load all libraries? (The time to transfer data from the disk block once the head has been positioned at the start of the block may be neglected.)True/False Garbage collection is a type of manual process.
- What does the following Python code do? import serial #Import Serial Library arduinoSerialData = serial.Serial('com11,9600) #Create Serial port object called arduinoSerialData while (1==1): if (arduinoSerialData.inWaiting()>0): myData = arduinoSerialData.readline() print myData O Nothing O Read data from the serial port and plot it on an x-y graph. O Read data from the serial port and displays it on the screen. O Reads data once from the serial port and displays one piece of data on the screen.Text Encryption Encryption plays an important role in protecting messages that are transmitted across the network. There are many symmetric and asymmetric encryption techniques that can be used in order to encrypt text messages. Some of these techniques are Caesar, Rows-Columns Transposition, Rail- fence, and Playfair cipher encryption as well as advance encryption algorithms. In this project, you are required to write a code that is capable of encrypting any given text (or text file) into a cipher text using any two different methods. You should prompt the user to choose the method that they would like to encrypt their text from a given list. Challenge: develop your code to decrypt the cipher text that is encrypted above Example: Assume the text TO SERVE AND TO PROTECT is required to be encrypted using Row-Column with the password ALERT Then the text message in Rows-Columns Transposition will become: TVTTSAPCOEOEENRTRDOX. The same text message in Rail-fence with depth of 4 would…| ZV1O = السؤال The memory that directly communicate with CPU is called auxiliary mamory. true false حفظ الاجابة