First, make a directory temp inside your personal directory. Then, position yourself in directory temp. Use relative pathnames to copy into temp all of the files in /home/OMIS107/HW2 whose name ends with 120, 121, 122, ..., up to 180 included. (one or two cp commands). aaaa
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- A company has implemented a discretionary access control system for important documents and programs on a shared Linux server. Figure 1 shows the current implementation of the DAC system. It only applies to the directory /opt/company (you can ignore all files/directories that are not within this directory). The list of users is shown in the output from the firstls command; the members of each group is shown in the output of the tail command; the permissions are shown in the output of the second ls command. Assume the files are the objects, the subjects are the five users and there are four access rights: own, read, write and execute. Refer to Figure 4.2 and Table 2 in the textbook and complete the following subquestions I. Draw the Access Control Lists that illustrate the implementation on the Linux server; II. Draw the Capability Lists that illustrate the implementation on the Linux server; III. Build the Authorization Table that illustrate the implementation on the Linux server.find The find command takes a pattern as a command-line argument and recur- sively searches through directories to find a filename matching that pattern. It should print a relative path starting with "./" for every file/directory that matches. For example, running ./find 1s.c from within the hw2 directory should print ./1s.c. If run from the parent directory, the output would be . /hw2/1s.c. There may be multiple matches. If we run ./find .c from within the hw2 directory, we should see: ./find.c ./1s.c ./tree.c The output does not need to be sorted. If nothing matches, it shouldn't print anything. Pattern matching should be case sensitive.Exercise 1: Please create a script that print “Hello, your name.” • Exercise 2: Please create a directory call user_bin, and add it to PATH. Then mv script of Exercise 1 to user_bin. Then run it from your root directory.• Exercise 3: Add a new command call ‘l’ which will perform exact same as ‘ls -a’. • Exercise 4: Create a function call sortFile, which will sort all filenames of current directory. Exercise 6: Could you add one variable in the example, name the variable as greeting, which displays “Hello, my name is xxx xxx” in the body using variable greeting
- A fictitious command madeup reads lines of input from the console until the end-of-file (EOF) character is read. For each line, if the content is a valid user ID in the system then the full pathname of the user's home directory is written to the console; if the context is not a valid user ID, an error message is written. Show how this command could be used to process a file containing zero or more user IDs (one per line), and the output saved to tow files (one for valid user output, one for error messages).Write the command that will create a tar archive of all the files in the directory named"/fir/sec/thi", that exists on the local machine. The name of the tar archive is "/tmp/animal".The command should be executed from the directory /home/user1. Write the command that will extract the tar archive that was created in Question #63. The contentsof the archive should be placed in the directory "/two/four/six". The command should be executedwhile the current directory is /tmp.You need to send a backup copy of the /etc directory across the network. To create the file, use the tar command with the -cf switches to create a new archive file. Use -z as the preceding option to compress the file. In this lab, your task is to: Create a compressed archive of the /sales directory and all its contents Name the file /salesbkp.tar.gz and save it in the root directory (/).
- • Exercise 1: Please create a script that print “Hello, your name.” • Exercise 2: Please create a directory call user_bin, and add it to PATH. Then mv script of Exercise 1 to user_bin. Then run it from your root directory.• Exercise 3: Add a new command call ‘l’ which will perform exact same as ‘ls -a’. • Exercise 4: Create a function call sortFile, which will sort all filenames of current directory.• Exercise 5: Please make your own page using shell script, print following as your page. <html><head><title>My System Information</title></head><body><h1>My System Information</h1></body></html> Exercise 6: Could you add one variable in the example, name the variable as greeting, which displays “Hello, my name is xxx xxx” in the body using variable greeting.• Exercise 7: Could you add one variable in the example, name the variable as FILE_LIST, which displays the filenames of current working directoryAssume that you are trying to delete a directory [temp) using the command rmdir but you have received a failed message indicating that the directory not empty. Which command from the following you would execute to accomplish the task? 1 out of O a. rm -a question O b. m -r temp Oc mrdir -r temp Od im p tempYou noticed a file in your home directory that has a + symbol appended to the mode.What does this indicate?a. Special permissions have been set on the file.b. The file has one or more files on the filesystem that are hard linked to it.c. The sticky bit directory permission has been set on the file and will remain inactiveas a result.d. Additional entries exist within the ACL of the file that can be viewed using thegetfacl command.
- Create an application that uses a socket connection to allow a client to specify a file name of a text file and have the server send the contents of the file or indicate the file does not exist. The server must contain a text based password file ("user name" & "password"). The client must pass a valid username and password to establish a connection with the Server (see Note 1). Notes: 1. A much better approach would be to encrypt the password file. The Java Cryptographic Extension (available since JDK 1.4) provides an API. Java Cryptography Architecture Reference Guide (JCA Guide): on oracle Introduction, Code Examples - Computing a Message Digest Object (i.e. one-way hash; using SHA-1) -Please ensure that it works need clear help compiling properly with no errors.Imagine you are in your practice directory. Imagine you have a subdirectory there called permDir. In octal mode, recursively change the permissions on all files and directories under permDir to be the following: user: read, write, and execute group: read, write others: none What command/options would you use to recursively change permissions? What command/options would you use to recursively check to see that you were successful?Write a batch scriptthrough which you have to createa directory (folder) in “E”partition of system and name it “OSTaskOne”.After this step display “Part 1 completed”.Now create a text file in the same partition with “FirstName” as its name.After this step display “Part 2 completed”.Now move the “FirstName” file inside your newly created directory and after moving it change its name to “SecondName”and open it using batch command.
