Interview Question | What is UID and GID in Linux | User Identifier | Group Identifier in Linux

Interview Question | What is UID and GID in Linux | User Identifier | Group Identifier in Linux

In This Post we cover, What is UID in Linux, What is GID in Linux, What do you understanding of UID and GID in Linux, UID 1000, Default UID value,What is uid and gid for the root user?
What is UID and GID in Linux ?
What is UID and GID in Linux ?
What is UID in Linux ?
How to Default value of UID ?
What is differences of UID and GID ?
What is uid and gid for the root user?

UID : User Identifier

UID (User identifier)is a number that assigned by Linux to every user of the system. UIDs are stored in the /etc/passwd

Value of UID

0 to 99 value = System

100 to 499 = Reserved for dynamic allocation

500 / 1000 = Reserved for new users

How to Check Default UID Value ?

We can check default uid value by the command :
cat /etc/login.defs | grep UID
Output something like this

UID_MIN 1000
UID_MAX 60000
#SYS_UID_MIN 100
#SYS_UID_MAX 999


What is UID and GID of root User ?


root is the first user of the system so uid and gid is 0

GID : Group Identifier


All Groups of Linux are defined by GIDs (group IDs). GIDs are stored in the /etc/groups file. the first 100 GIDs are usually reserved for system use.


Difference UID and GID


UID

UID full form is User Identifier, It Used to assign a Identity Number of User
UID Store in /etc/passwd

GID

GID full form is Group Identifier, It Used to assign a Identity Number of Group
GID Store in /etc/group



Thanks

End of this UID & GID 
 topic,  we need your support so i request you to please comment if something missed by me, share and like this post.

www.linuxtopic.com
Previous
Next Post »