Problem 1: Write a Bash script that takes the name of a file or directory as an argument, 1. reports if it is a directory or a file, and if the user has read, write and execute permission on the file or directory, and 2. if it is a file, reports the size of the file and the category of the file based on its size. If the file size is greater than 1MB (1048576B), the file is a large file; if the file size is less than or equal to 1MB (1048576B) and the file size is greater than 100KB (10240OB), the file is a medium file; otherwise, it is a small file. Use a sequence of if statements on the file name or file size to determine the information. To get the file size, use command du -b and command cut. Read their manual for how to use them.

Create a bash script to manage users. The script will take three script arguments: an input filename of users, a group name, and an operation flag. The input filename of users to manage will be a text file with a list of users to add to the system or remove from the system. Each line in the file will contain a User ID and an encrypted password, which are separated by a space character as a delimiter. Your input user file should have at least five users. You will need to encrypt your passwords via the command line using openssl and place the generated password in your input user file. Write a script that adds and removes users to a Linux system using the input file provided to the script. The users should be added to group provided in the script argument. You will want to check if the group already exists. Use an operation of -a to signify to add the users to the system and an operation of -r to signify removing the users from the system. When adding users, make sure you create the…

To improve performance when reading files, "block read ahead" can be performed. What is this?   A. The operating system determines, when reading block K, if the file is being read sequentially. If it is, the file system will retrieve block K, and initiate the request for block K+1 in the file.   B. The operating system determines, when writing block K, if the file is being written sequentially. If it is, the file system will retrieve block K, and initiate the request for block K+1 in the file.   C. The operating system determines when reading block K if that block was accessed via a seek. If it is, the file system will retrieve block K, and initiate the request for the next block in the file that is needed by the process.   D. All of the above

- Malicious code that must attach itself to another file to replicate itself is known as: - A program that wastefully consumes resources is called a: - Consider the following fragment in an authentication program: code... if date = 5-5-2020 then: crash_operating_system(); code... What type of malicious software is this? -When a security critical process occurs in stages, we may have a: - Not validating the input and its length before attempting to write it to a buffer is: