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Permissions and chmod

————————————————————————————-
|                owner                 |                    group             |               everyone           |
————————————————————————————-
| read | write | execute | read | write | execute | read | write | execute |
————————————————————————————-
| 400 |    200 |     100     |   40   |  20    |        10     |     4    |     2     |        1        |
————————————————————————————–

Refer by: http://www.linuxquestions.org/linux/answers/Security/Quick_and_Dirty_Guide_to_Linux_File_Permissions

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