Questions tagged [uid]
The uid tag has no summary.
85 questions
4 votes
1 answer
452 views
On Debian, XFS, I can edit a file of another user with permissions 644 without ACL
today to my surprise I have noticed that I may delete a file that was created by a user with UID 100024 while being logged to my normal user (UID 1000) shell. The UID 100024 is a subuid, it is how the ...
- 153
1 vote
0 answers
334 views
How do I use static UIDs and GIDs for services in my yocto build?
I have a piece of equipment running a yocto build. This build includes services like ssh-server, mysql, and ntp, with each run as their own users. mysql is UID 999, sshd is UID 998, etc. In my ...
- 45
3 votes
0 answers
208 views
Why can't root bypass permissions in an ID-mapped mount?
Why does global root (root in the initial user namespace) not have the ability to read all files regardless of permission when ID-mapped mounts (see "ID-mapped mounts" under man 2 ...
0 votes
2 answers
1k views
Is it possible to create multiple users on Linux with the same UID and GID, especially UID and GID 0?
The ArchWiki - rsnapshot page mentions creating multiple users with uid and gid set to 0 as a means of creating users that login remotely to perform backups. One thing you can do to mitigate the ...
- 7,919
1 vote
2 answers
540 views
What should the group of a user in Linux be to access samba?
I have a friend who works at a business where the IT guy has passed away and I am trying to help them until they can hire someone else. It is a workgroup networked with a Linux server. They recently ...
0 votes
2 answers
712 views
How to make command `id` print different real and effective UID in Ubuntu
The info page of command id states that it will output the effective user ID if different from the real user ID. I have been trying to achieve that somehow, running the command with the Bash shell as ...
- 13
1 vote
0 answers
595 views
What causes `newuidmap` to be dissallowed in new user namespace?
I expected uid=0(root) gid=0(root) groups=0(root) to be the output of both $ rootlesskit id $ unshare -U bash -c 'newuidmap $$ 0 '"$(id -u)"' 1; id' however the somewhat more verbose -x ...
- 15.3k
0 votes
0 answers
450 views
What is everybody user & group on Android and why there's no everybody user & group on Linux?
In Root Explorer I have the option 9997-everybody and 9999-nobody. If I change the owner of any file to everybody:everybody, will it be fully editable by all users? This user does not exist on the ...
0 votes
1 answer
603 views
Which UID/GID is free for new package
After reading https://unix.stackexchange.com/a/222376/246754 How rpm ensure that no uid/gid clash with each other ? What I am looking is similar to https://github.com/NixOS/nixpkgs/blob/...
- 103
1 vote
1 answer
321 views
Why does the UID of /dev/tty1, tty2 change preiodically on Ubuntu 22.04
I am on Ubuntu 22.04. I noticed that the tty which runs the Ubuntu GUI periodically changes from tty2, to tty3, what is the reason for this? I also noticed other UID changes, for instance tty1 has ...
user321380
0 votes
2 answers
175 views
Loop over users problem
I am struggling with a loop over users id, i want to list all the users in /etc/passwd whose id are greater than 999, it doesn't recognize my if .. fi sentence and it is important to say that I am ...
-1 votes
1 answer
655 views
passwd source code
I am trying to look at the source code of the passwd and gpasswd programs. These tools check the effective UID set to zero to complete execution successfully. But I am a noob to C and couldn't find ...
- 141
11 votes
2 answers
4k views
Is there a file besides /etc/passwd that contains/defines my UID?
Trying to learn about UIDs and GIDs. Various online reading led me to believe that my UID is saved in /etc/passwd, but this doesn't appear to be the case on a server where I work: $ whoami user1 $ cat ...
- 1,957
1 vote
3 answers
1k views
Which command should I use as root to spawn a process with overridden numeric uid/gid/groups?
Which command (available in distro repositories) should I use start a shell with specified numeric uid, gid and groups? Typically su is used to change from root to other user, but it tries to look up ...
- 6,005
0 votes
0 answers
1k views
undo usermod for root?
At some point where I wanted to do sudo usermod -v 1000-1000 USER sudo usermod -w 1000-1000 USER I accidentally applied both these commands to root. According to the documentation I can undo these ...
- 579