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[Pink Panther]

What exactly do my following default permissions mean:
Files   6 4 0
Directories   7 5 0

What is the maximum security configuratin?
What is optimal permission configuration?

[wuischke]

1 means that the iser is allowed to execute the file or browse the folder
2 means that the user has the permission to write to the file or create files in the folder
4 means that user may read to the file or view the files in the folder

Then you just add them and you get the number
4+2=6(read+write)
4(read)
0(no permissions)

4+2+1=7(view files+create files+browse folder)
4+1)5(view files+browse folder)

What is the maximum security configuratin?

000

What is optimal permission configuration?

As always it's a compromise between security and comfort. I've set it to 644 for files and 750 for folders.

[Pink Panther]

Hi wuischke,
Thanks for a beautiful complete answer!
Yes, 000 is maximum security configuration indeed...

[ken]

What wuischke left out of his description is that the three digits stand for: owner's permissions, group's permissions, everybody else's permissions.

So, 6 4 0 means: owner may read and write, group may read, everybody else has no access permissions.

And 0 0 0 actually denies everybody, including you, the owner, permission to access the file.  There's really no reasons to change the first digit.