Assume in your homedirectory, you have a file called "file.txt" Change the permissions of the file so the owner can read and write; the group can read; and everyone else doesn’t have any permissions with one command?

Answer 1

To change the permissions of a file called "File.txt" so that the owner can read and write, the group can read, and everyone else has no permissions, you can use the chmod command with the octal number 644 (equivalent to rw-r--r--): "chmod 644file.txt."