CODEWITHSUNDEEP
linuxbuildrootusermode
M.Ferru
M.Ferru

Reputation: 435

How to add user to a group without usermod?

Is it possible to add a user to a group without usermod? I'm working on embedded Linux 3.14.52 and I don't have the usermod command line. If it is not possible, how add this command to kernel with Buildroot?

Upvotes: 6

Views: 13460

Answers (3)

AmirAli Taherdoust
AmirAli Taherdoust

Reputation: 1

Also, you can create groups by assigning them to that user at first with -G option.

sudo useradd -G group1,group2 username1

You can check the user groups by typing

id username1

output :

uid=1000(username1) gid=1002(username1) groups=1002(username1),1000(group1),1001(group2)

Upvotes: 0

Arnout
Arnout

Reputation: 3464

In Buildroot, users and groups are created with the BR2_ROOTFS_USERS_TABLES configuration option. Set it to a file or list of files or users you want to create. See section 9.6 of the Buildroot manual. Note that this only allows you to specify users; groups are created automatically when a user is assigned to a group.

Alternatively, you can take control of the entire /etc/groups file by adding a filesystem overlay.

To update the group configuration at runtime, you can use the addgroup and delgroup utilities in busybox.

Upvotes: 2

Andrea Carron
Andrea Carron

Reputation: 1021

The user<->group association is saved in the /etc/group file. Each line of the file is in the format:

group_name:password:GID:user_list

You can add users in the comma-separated user_list part. If you prefer to use some existing tool, you can consider gpasswd (if available).

I don't know how to help you for the kernel/buildroot question.

Upvotes: 2

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