UNIX, how would you remove the directory test and all files and subdirectories (recursively) in it? The directory test is located in (is a subdirectory of) /home/myid/smith/projects. O rmdir /home/myid/smith/projects/test rmdir -r /home/myid/smith/projects/test rm -r /home/myid/smith/projects/test O rm -r projects/test
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- A student launches the Python interpreter from his home directory. His home directory contains another directory called 'mydir', and 'mydir' contains two files called 'foo' and 'bar'. The home directory does not contain any files, only other directories. What will happen when he writes the following code at the Python prompt: >>> import os >>> filenames = os.listdir('mydir') >>> f= open(filenames[0]) ===================================================================================== A variable f representing a file object will be created, and the first file in the directory 'mydir' will be opened for writing in text mode. An error will be produced stating that the file to be opened does not exist. An error will be produced stating that filename is not subscriptable. A variable f representing a file object will be created, and the first file in the directory 'mydir' will be opened.In C++ Implement a simple version of the linux grep command in C++. grep - Looks through a file, line by line, trying to find a user-specified search term in the line. If a line has the word within it, the line is printed out, otherwise it is not. Use the system calls open(), getline(), close(). Requirements (examples run from. terminal) Your program grep is always passed a search term and zero or more files to grep through (thus, more than one is possible). It should go through each line and see if the search term is in it; if so, the line should be printed, and if not, the line should be skipped. [terminal]$ ./grep ! main.cpp main2.cppcout << "Hello, World!";cout << "Programming is great fun!"; The matching is case sensitive. Thus, if searching for world, lines with World will not match. Lines can be arbitrarily long (that is, you may see many many characters before you encounter a newline character, \n). grep should work as expected even with very long lines. For…Write a shell program that counts the number of files in a given directory. Thedirectory should be specified as a command line argument. The program doesnot need to count files recursively in subdirectories; instead, it should not count subdirectories at all.
- implementation of Caesar Cipher:You are required to implement the Caesar Cipher encryption/decryption algorithm in Python. Remember to implement the algorithm in such a way that it takes a file as input, encrypts it and store in the current directory. This encrypted file must checkable. The implementation must have a decryption procedure which takes the encrypted file from the current directory, decrypts it and store it with some specific name in the current directory. The name should be different from the original file so that it can be verified.Given a valid file object, f, which of the following calls will return the entire contents of the file in a scalar x? x = f.readline() x = f.readlines() x = f.read() X = read(f)Computer Science Write a C/C++ program, call it findExt, to find all files in a directory hierarchy, whose extensions are in the extension list provided as arguments to the program. Your program should print the whole pathnames of the found files. Synopsis: findExt <extension-list> [-t target-directory] When target-directory is missing, the working directory (./) will be the target directory Some sample runs: $ findExt txt pdf That is, find all files whose extensions are either txt or pdf in the directory hierarchy ./ $ findExt jpg -t $HOME //target directory is home directory That is, find all files whose extensions is jpg in the directory hierarchy $HOME Requirement: - You must use the system call nftw() that allows you to walk across a file tree. This system call will do all the recursive walk and each time it visits a file or a directory, it will call your own function (a function that you pass as a parameter).
- If wrong answer this time will downvote it Create a class with a static main that tests the ability to resolve and print a Path: • Create an instance of a FileSystem class. • Resolve an instance of a Path interface from a directory path and filename. • Print the constructed Path with System.out.println() method. 2. Create a class with a static main that tests the ability to resolve and print a Path: • Create an array of Path class. • Instantiate instances of Path with absolute and relative paths. • Print the constructed elements of the array of Path class with System.out.println() method. 3. Create a class to test serialisation class that implements serializable, it should implement the following: • A static void method that serialises an object. • A static void method that deserializes an object. • A static main method that tests the two by moving an object from one to the otherNeed help to implement networking in python Server.py Load data from file This option will ask the user for a fully qualified path and will load a JSON file containing the information for users and pending messages. The format of the JSON file will be defined based on your implementation and it will the same used to save the data into file (menu option #4). Functionalities the server must provide: 1) User Sign Up: adds a user identified by a phone number to the system. a) Protocol: USR|username|password|display_name b) Response: 0|OK for success. 1| for an error. c) The server should validate that the username does not exist 2) User Sign In: verify user credentials a) Protocol: LOG|username|password b) Response: i) 0|OK → the credentials are correct. ii) 1|Invalid Credentials iii) 2|Already Logged In → in case that the user is logged in from another client. c) This will help the server knowing which user is connected. d) The server should keep a list of connected clients, which should…UNIX ASSIGNMENT - IXQuestion 9 : In an organisation one wants to know how many programmers are there. The employee data is stored in a file called ‘personnel’ with one record per employee. Every record has field for designation. How can grep be used for this purpose?
- Unix-based operating systems usually include a tool named tail. It displays the last 10 lines of a file whose name is provided as a command line argument. Write a Java program that provides the same behavior i.e. the user can specify how many lines to print from the terminal. Display an appropriate error message if the file requested by the user does not exist, or if the command line argument is omitted. Note: Make sure to display the last n lines of a file whose name is provided as a command line argument. You might need to pass a file as an argument, therefore make sure to have access to a sample file, the contents of which you want to print out.Implement a simple version of the linux grep command in C++. grep - Looks through a file, line by line, trying to find a user-specified search term in the line. If a line has the word within it, the line is printed out, otherwise it is not. Use the system calls open(), getline(), close(). Requirements (examples run from. terminal) Your program grep is always passed a search term and zero or more files to grep through (thus, more than one is possible). It should go through each line and see if the search term is in it; if so, the line should be printed, and if not, the line should be skipped. [terminal]$ ./grep ! main.cpp main2.cppcout << "Hello, World!";cout << "Programming is great fun!"; The matching is case sensitive. Thus, if searching for world, lines with World will not match. Lines can be arbitrarily long (that is, you may see many many characters before you encounter a newline character, \n). grep should work as expected even with very long lines. For this,…Kindly help me with this python program write a system to support sending and receiving of quotes. The client program will connect to a quote server which in turn will send out a quote to that specific client. The quote server will read a file containing one-liner quotes stored on a text file that will be the basis for quotes sent to clients