Trivial information alert. For those curious about "chmod 666", the Unix command "chmod" stands for "change mode" which changes the way a file can be read. Each file has 4 octal (base 8) number associated with it. Each octal number represents 3 binary bits such that 000 is 0, 001 is 1, 010 is 2, 011 is 3, 100 is 4, 101 is 5, 110 is 6, and 111 is 7. The first of the three bits is for "read", the second bit is for "write", and the third bit is for "execute" meaning that it is a program that can be run. If the bit is on or "1", then you can do the thing that it represents. There are 3 octal numbers representing the rights that the owner of the file has, the rights that the files group has, and the rights that everyone else has. A 4th octal number can specify some other information about the file that is much more complicated but most people just deal with the 3 octal numbers. Got it? So if you want to set a file so that the owner, the group, and others can read or write the file, you use the octal number for 110 which is 6 three times. You see the number isn't six hundred and sixty six but (6 * 64) + (6 * 8) + 6 = 438, hardly a demonic number.