What do you understand by File modes in Unix?

File modes are basically permissions or access rights. The permissions that are given to the "user", "group" and "others" classes. It indicates to the system the types of files that each person can access, as well as the amount of access each one is allowed.

There are four main classes; each one with its own reference and set of permissions.

Reference

Class

Description

u

user

the owner of the file

g

group

users who are members of the file's group

o

others

users who are not the owner of the file or members of the group

a

all

all three of the above, is the same asĀ ugo

Once assigned, the modes are not permanent. They can be changed. In traditional Unix permissions, modes can be changed with chmod. In Access Control Lists, modes can be changed with setfacl (for).

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