Lab $4$ Linux Permissions

Instructions:

Create a Directory Structure:

Create a directory called permissions$\_$lab.

Inside permissions$\_$lab, create three subdirectories: documents, scripts, and media.

Create Files:

Inside the documents directory, create two text files: file$1.$txt and file$2.$txt$.$

Initial Permissions:

Check and note the initial permissions of all files and directories using the ls $-$l command.

Change Permissions Using Symbolic Notation:

Change the permissions of file$1.$txt to allow the owner to read and write, the group to read, and others

to have no permissions.

chmod u$=$rw$,$g$=$r$,$o$=$ file$1.$txt

Check the updated permissions.

Change Permissions Using Octal Notation:

Change the permissions of file$2.$txt to allow the owner to read, write, and execute, the group to read and

execute, and others to execute only.

chmod $711$ file$2.$txt

Check the updated permissions.

Recursively Apply Permissions:

Apply the permission rw$-$r$--$r$--$ to all files in the scripts directory, and rwxr$-$xr$-$x to all files in the media

directory, including subdirectories.

chmod $-$R $644$ scripts chmod $-$R $755$ media

Check the updated permissions.

User and Group Ownership:

Change the ownership of file$1.$txt to a different user and group. Verify the ownership changes.

Understanding Numeric Permissions:

Experiment with numeric permissions on file$2.$txt$.$ Change the permissions using octal notation in a way

that allows the owner to write, the group to read and execute, and others to have no permissions.

Confirm the changes.

Advanced Permission Setting:

For the permissions$\_$lab directory, set permissions in a way that allows the owner to read, write, and

execute, the group to read and execute, and others to have no permissions. Confirm the changes.

Revoke Permissions:

Remove the execute permission for others on file$2.$txt and verify the changes.

Script Execution:

Create a simple script file named myscript.sh in the scripts directory. Allow the owner and group to

execute it$,$ but others should have no permissions. Test the script execution.

Masking Permissions:

Create a directory named masked$\_$dir. Set its permissions to rwxrwxrwx $(777).$ Inside this directory,

create a file. Try setting restrictive permissions on the file, and observe if it is affected by the parent

directory's permissions.

Combining Symbolic and Octal Notations:

In the media directory, set permissions for file$1.$mp$4$ using both symbolic and octal notations. Verify the

changes.

Remove a File Securely:

Remove file$2.$txt in a way that ensures a confirmation prompt is provided, preventing accidental deletion.

Document the command used.