Adding users

Posted on 1998-09-15
Last Modified: 2010-04-20
I am trying to create a web interface that will enable me to create new users on a Linux system.  What I was thinking of doing was sending a file over to the Linux system by FTP which contains the relevant details of the new user.  I would then use Cron to check every n minutes if this file exists.  If it does a script would be run which would create the new user.  Does this sound possible.  In particular I would like details of the shell script necessary to create the new user, taking the details from the indicator file sent over by FTP.
Question by:bsufs
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Expert Comment

ID: 1638032
I think it would be risky to execute as root something on information that comes from outside ...

If you want to create a web interface, think it as a security risk you need to secure, try to get inspiration from any of the working programs that do this (as

Expert Comment

ID: 1638033
In case of running a Web-Server on this Linux-System you can imply create a cgi to get the User-Information from the Web-Page. The cgi could insert the User-Data in the /etc/passwd File.


Author Comment

ID: 1638034
The web server is not running on the Linux system that I want to add users to.  I could write a script that will insert information into the /etc/passwd file but what would you do about the password which needs to be encrypted.  Would it then be possible to write a script that changes the password?

Thanks for your help.
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Accepted Solution

nobbs earned 200 total points
ID: 1638035
You can use the useradd command from a script, so the user will be inserted with password.

Author Comment

ID: 1638036
useradd doesn't work on my system but adduser does.  How would you run this from a script? - it prompts the user step-by-step for inputs.  What I want to do is add the user all in one go, taking the information from the script.  Could you give me a hint as to how I would do this.

Thanks for your help.

Expert Comment

ID: 1638037
I don't know adduser, but on a normal Linux-System, you shold have the useradd command.

Author Comment

ID: 1638038
I don't have useradd but I think adduser is the same.  What I'd like to know is, is it possible to call such a command which requires inputs from a script?


Expert Comment

ID: 1638039
You will find a complete script at:

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