file_permissions

# Create file
$ touch /tmp/file.tmp
$ l /tmp/file.tmp
-rw-r--r--  1 jmeyer1  wheel     0B Jun 16 15:59 /tmp/file.tmp

# Change owner to root
$ sudo chown root /tmp/file.tmp
$ l /tmp/file.tmp
-rw-r--r--  1 root  wheel     0B Jun 16 15:59 /tmp/file.tmp

# Change permissions
$ sudo chmod 755 /tmp/file.tmp
$ l /tmp/file.tmp
-rwxr-xr-x  1 root  wheel     0B Jun 16 15:59 /tmp/file.tmp

# Change permissions for root
$ sudo chmod g=rx /tmp/file.tmp
$ l /tmp/file.tmp
-r-xr-xr-x  1 root  wheel     0B Jun 16 15:59 /tmp/file.tmp