Hot answers tagged useradd
-g sets the initial, or primary, group. This is what appears in the group field in /etc/passwd. On many distributions the primary group name is the same as the user name. -G sets the supplementary, or additional, groups. These are the groups in /etc/group that list your user account. This might include groups such as sudo, staff, etc.
They are not the same. The -g option specifies the "primary" group that a user should belong to, while the -G option specifies one or many supplementary ("secondary") groups. On a work machine I have access to I have $ id uid=1001(me) gid=1001(me) groups=1001(me),27(sudo),110(lxd),1005(theproject) This shows that my "primary" group is me (same as my ...
can't create lock file /etc/mtab~60598: No space left on device (use -n flag to override) open("/etc/passwd.63618", O_WRONLY|O_CREAT|O_EXCL, 0600) = -1 ENOSPC (No space left on device) It's definitely a disk space problem. Most filesystems have two limits: a limit on file contents, and a limit on the number of files — the size of the inode table. Since ...
The group applied via -g is the primary group, so for example when you create a file it will default to making it with your primary group as the group associated with that file. You can however temporarily change which group it uses as default with the sg or newgrp commands. All groups in the -G are secondary groups. More about this here
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