Ways to set Linux file and directory permissions

1. Character notation

Type operation permissions

U +r

G -W

o =x

A

The type represents the object that modifies the permission, U represents the user of the file, G represents the group of the file owner, O represents a non-user group user, and a represents Ugo

Action + represents an increase in permissions,-Indicates reduced permissions, = indicates permissions granted

The permission R is read-only, W is writable, and X indicates an executable

[[Email protected] ~] # mkdir Perm

[[Email protected] ~] # CD Perm

[[email protected] perm] # mkdir Test

[[email protected] PERM] # CD Test

[[email protected] test] # touch Test1

[[email protected] test] # touch Test2

Here are the test commands, see

chmod u-w Test

chmod g+w Test

chmod ug+w Test

chmod ugo-x Test

chmod a+x Test

chmod o=w Test

chmod a= Perm

Chmod-r a+rwx Perm

2, digital notation

Permission numbers

R4

W2

X1

-0

For example, rwx numeric representation is 4+2+1=7, which is actually a binary representation, rwx three-bit bit,111, or 7

Example:

chmod 577 Test

chmod 555 Test

Chmod-r 754 test//-r parameter means recursion

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Ways to set Linux file and directory permissions