Why would Ulf refuse to run the command “chmod-Are 777/home/ulf”?
A.
The command will copy all his files to a public directory
B.
The command will allow everyone to read, write and execute all files in his directory
C.
The command will create problems when his profile file initialises his user settings
D.
The command is known to have security breaches associated with it, and should be avoided.
Explanation:
Each position of the three digit number controls security for a different entity. The first digit is for owner, middle for group access, and the last for everyone else. A 7 in a position gives full access (including read and write), and a 777 gives full control to everyone. In this case, executing the command would open Ulf’s home directory to everyone, who can access his directory and change or erase his files.
Incorrect Answers:
A: The chmod command affects permissions, it does not copy files.
C: This command will not create problems, since there will be no restrictions.
D: This is a very critical command in the Unix system, and must not have security breaches since it is used a lot.
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