Useradd
From X86wiki
The useradd command is part of the pwdutils package utility suite, a product of the Free Software Foundation. The source code file is useradd.c. This suite also includes commands to manage the shadow and password files. Referenced sometimes as shadow-utils in the Fedora project.
A model user directory is usually copied from /etc/skel
[edit] References
- http://directory.fsf.org/project/pwdutils/
- http://directory.fsf.org/category/admin/ System Administration - related.
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[edit] Question
¿where {is, can we find} the source code for useradd and usermod shell commands?