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Chmod777:

Chmod mod refers to the permission of the files

1 is for execute
2 for read
4 for write

Use 777 only when it is necessary since it is quite dangerous and free for all.

They add up to 7, for 7 you are giving all rights read, write and execute.

The 3 "7" refers to 
owner
group
user
 

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"chmod 777” means making the file readable, writable and executable by everyone.

And the security concern is that it provide permissions  to everyone which is not a good practice in security.

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