I have previously written these two articles for creating users in the main used Linux distributions.
Now, I will show you 10 more useradd oneliners, for creating users in all the Linux and Unix systems.
Example 1.The most used useradd command:
$ sudo useradd -m -d /home/mike1 -s /bin/bash -c "the mike1 user" -U mike1
Explanation:
- -m -d /home/mike1 : the -m argument creates the /home/mike1 homedirectory, specified by the -d argument
- -s /bin/bash : the -s is used for specifing the user’s default shell, /bin/bash in this case
- -c “message” : extra information about the user
Example 2:
$ sudo useradd -m -d /home/geeks/mike2 -s /bin/zsh -c "the mike2 user" -u 1099 -g 1050 mike2
Explanation:
- -m -d /home/geeks/mike2 : the -m argument creates the /home/geeks/mike2 homedirectory, specified by the -d argument . as you can notice, the homedir can be different that /home/user_name
- -s /bin/zsh : the -s is used for specifing the user’s default shell, /bin/zsh in the case
- -c “the mike2 user” : extra information about the user
- -u 1099 : the new user’s UID, in this case 1099
- -g 1050 : the user belongs to the group with the 1050 GID
Example 3:
$ sudo useradd -m -d /home/mike3 -s /usr/sbin/nologin -c "nologin user" -u 1098 mike3
Explanation:
- -m -d /home/mike3 : the -m argument creates the /home/mike3 homedirectory, specified by the -d argument
- -s /usr/sbin/nologin : the -s is used for specifing the user’s default shell, in this case /usr/sbin/nologin . mike3 cannot login to the system with su, but can login by ssh. Read more about the nologin shells here.
- -c “nologin user” : extra information about the user
- -u 1098 : the new user’s UID, in this case 1098
Example 4:
$ sudo useradd -m -d /home/mike4 -k /etc/custom.skell -s /bin/tcsh -c "mike4 user" -u 1097 mike4
Explanation:
- -m -d /home/mike4 : the -m argument creates the /home/mike4 homedirectory, specified by the -d argument
- -s /bin/tcsh : the -s is used for specifing the user’s default shell, /bin/tcsh in this case
- -k /etc/custom.skel : another skeleton directory, /etc/custom.skell in this case, different than the default skeleton directory /etc/skel
- -c “mike4 user” : extra information about the user
- -u 1097 : the new user’s UID, in this case 1097
Example 5:
$ sudo useradd -M -N -r -s /bin/false -c "system user" sys_user
Explanation:
- -M : the -M argument tells the system not to create a home directory
- -N : the -N argument tells the system not to create a group having the user’s name
- -r : the -r arguments is for creating a system user
- -s /bin/false : the -s is used for specifing the user’s default shell, /bin/false in this case. The users having /bin/false as the default shell, cannot login to the system. Read more about the nologin shells here.
- -c “system user” : extra information about the user
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