UC3M

You must create the folder or directory structure that is indicated in the figure, and the directory “Working_Group” must be under the path /home/teleco. Execute the command sequence that is needed for that, taking into account that the directory initial location where you are in the system can be whatever, and the command sequence must work correctly with independency of the initial directory where you are located. In order to do this, you must use the commands mkdir and cd. Another mandatory requirement is that you must use the command mkdir using an absolute path in one of the commands but also a relative path in another command.

Next, you must assign the proper permissions to each directory, so that you can have control about who can access these directories and with what permissions. All the directories must have read and execute permissions for the members of the owner's Linux group, and in addition write permissions for the directory owner, and none permissions for the rest. Moreover, there is an exception, for the directory Budget, permissions must be read, write and execution for the directory owner, and none permissions for the rest, because only the project boss is allowed to operate with the budget files. Execute the command sequence that is needed for assigning all of these permissions, taking into account that the directory initial location where you are in the system can be whatever, and the command sequence must work correctly with independency of the initial directory where you are located. In order to do this, you must use the commands chmod and cd. Another mandatory requirement is that you must use the command chmod using an absolute path in one of the commands but also a relative path in another command.

Next, you must create a file description.txt under the directory P1 which must include inside the file the text “Project Description”. In order to achieve it, it is mandatory to use the command echo and the output redirection.

Copy the file description.txt from the folder P1 to the folders P2 and P3, so that the file will also be present in these other folders. In order to achieve it, you must use the command cp.

Copy the file description.txt also to the directory Budget, and to the directory Communication using the command cp. Next, change the name of the file that is under the directory Budget so that it is renamed into budget.ax, using the command mv. Next, replace completely the file text by the following text: “Budget file”. In order to achieve it, another requirement is that you must use the command echo and the output redirection.

Move the file description.txt that is under the directory Communication, to the directory Others, and at the same time change its name so that the new name must be others.txt. For all of this, you must use the command mv. Next, replace completely the file text by the following text: “Other issues”. In order to achieve it, another requirement is that you must use the command echo and the output redirection.

Using the command echo and the output redirection, modify the files “description.txt” that are under the directories P1, P2, and P3 , so that a blank space and the number 1, 2 or 3 repectively, are appended to the text that was in the file.

For all the files that have been created, assign the same permissions as the directories that contain these files.

Finally, put all the sequence of commands that you have done in a file called creation.sh with a text editor and save it. You must write a line for each one of the commands and in the same order that you did in this exercise. Futhermore, add the following text in the first line of the file:

#!/bin/bash

Assign permissions for the execution of the new created file. This new file that contains a command sequence is called script. If you execute this file from a command interpreter with ./creation.sh, then all the commands will be executed once in the established sequence. Therefore, if the same sequence of commands has to be executed later, then you will only have to execute the script this way, instead of typing everything, command by command.

First, execute the command date in order to show the present system date.

Second, show the present directory where you are located, that can be whichever in general. To do this, use the command pwd.

Show all the processes that are being executing in the Linux system in this moment. To do this, use the command ps.

Using the commands cd and ls, show the information about the files and subdirectories that are under each one of the 8 folders of the working group. The information must show at least the file or/and directory creation date, their size, and permissions.

Using the command grep, show all the files that contain the string “Project”, that are under some directory of the structure of the working group.

Finally, put all the sequence of commands that you have done for the generation of information in a file called information.sh with a text editor and save it. You must write a line for each one of the commands and in the same order that you did in this exercise. Futhermore, add the following text in the first line of the file:

#!/bin/bash

Assign permissions for the execution of the new created file.

Remove completely all the files and directories that are under the directory Projects, including the same Project directory. You must do it using only the command rm

Next, remove the file that is under the folder Others using the command rm.

Next, remove the directory Others using the command rmdir. Note that this is possible because there is not already any files under the directory Others.

Finally, put all the sequence of commands that you have done for the generation of information in a file called removal.sh with a text editor and save it. You must write a line for each one of the commands and in the same order that you did in this exercise. Futhermore, add the following text in the first line of the file:

#!/bin/bash

Assign permissions for the execution of the new created file.