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Note: On file permissions, in general never use 777 if you don't know what you are doing.
Each digit corresponds to a group of three letters each digit also corresponds to one set of permissions as follows:
Note: On some servers you may not see the numbers as shown above, what you see is rwxrwxrwx (777) or something similar.
NOTE: these permission can be applied to directories as well which is why you might see this drwxrwxrwx, the "d" is for directory.