How can you ensure that the current working directory's pathname is always presented as part of the tcsh prompt?
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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.How can you ensure that the pathname of the current working directory is always displayed as part of the tcsh prompt?How can you make sure that the tcsh prompt always shows the pathname of the current working directory?
- How can you make tcsh always display the pathname of the working directory as part of its prompt?If you are currently in your home directory, what is the relative pathname to the “address” file located under the mylocation subdirectory?With a relative pathname, which command might you use to convert to the /usr directory?
- What does the du -s /var command do? a. shows the users connected to the /var directory b. shows the size of all directories within the /var directory c. dumps the /var directory d. displays the total size of the /var directoryIn linux Add the /tmp directory to your PATH. Ensure that the PATH is available to all child shell sessions. This change does NOT need to persist across boots. What command(s) did you use for this?What is the full TCP Dump (tcpdump) command that you would use if you wanted to read a previously created file called "myPackets.pcap"?
- Which command could you use to change to the /usr directory using a relative pathname?Penetration programming Modify the script so that it also works interactively. Specifically, if no hostname is given on the command line, the program should interactively ask for a hostname, starting port, and ending port with three separate prompts, and carry out its scan using those values. After scanning finishes, the program should loop to receive another set of values, stopping only when the user enters a blank host name. If this feature is implemented properly, it will also allow you to run the script in ’batch’ mode, by “piping in” a plain text file with the hostname on the first line, start port on the second, stop port on the third, and repeating for as many hosts as you wish to scan. For example, if a file named hosts_to_scan.txt contains a list of hosts and ports in the proper format, the program should now work as follows: cat hosts_to_scan.txt | ./portscanner.sh The timeout argument should still work in this case as well: cat hosts_to_scan.txt | ./portscanner.sh -t 3…The application should support integrity verification. That is, your client and server will calculate the checksum of each file after it is transferred and compare them to make sure data is transferred without any error in the network in c++.
