Ubuntukylin base chmod to the owner of a file, the user group, and others add or remove permissions for read and write execution separately

Town Yard text:
The Confucian School of the practical and practical, line Buddhism Purdue sentient beings, the monastic Kangsheng fidelity, understanding of the easy to change the image. To science and technology to shine a good law, the achievement of a conscience blog.
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My system: Ubuntukylin 16.04 LTS 64bit

STEP0:

View permissions for a specified file

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Step1:

Subtract the owner's read and write execution permissions

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Step2:

View execution effects

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Step3:

Increase owner Read permissions and view execution effects

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STEP4:

Increase owner-written permissions and view performance

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STEP5:

Increase the permissions performed by the owner and see the effect of the execution

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STEP6:

Subtract the permissions that the group performs and view the execution effect

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STEP7:

Subtract permissions written by others and view execution effects

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U-User owner, the owner of this file is Chuxuan
Group user groups G, the user group for this file is ADM
O-Others other people, not chuxua and users of the ADM group

Read Reading R
Write Writing W--
Execute execution X

+ is the absence of the addition, there is no change.

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Ubuntukylin base chmod to the owner of a file, the user group, and others add or remove permissions for read and write execution separately