ADDUSER

Implementation of the adduser command in linux

EXECUTION:

• HERE THERE ARE TWO C FILES password.c and shadow.c and one header file server.h
• THE NAME OF THE MAKE FILE IS adduser.mk
• I have executed the makefile using make -f adducer.mk
• There are two text files passwd.txt and shadow.txt.
• The file passwd.txt stores the user information in this format oracle:c:1021:1020:Oracle user:/user/home:/bin/bash and the file shadow.txt stores the user's encrypted password

ABOUT THE PROGRAM:

• A program in C to mimic the adduser command on Linux.
• This command will add either an ordinary user or a system user.
• It has to handle 2 files passwd and shadow
• Both these files will be in some folder specified by an environment variable PFILE.
• The program has to take all arguments as command line arguments.

ASSUMPTIONS:

• User enters in this format adduser -u UID -g GID -c “Comments” name expirydate
• Where,UID is USER ID.
• GID is GROUP ID.
• Comments is the additional information.
• Name is the username
• Expiry date is the validity of password and user_account.
• The make file should be executed in this format cat -e -v -t makefile_name.mk
• This program has worked in Linux-OS and Mac-OS
• In this program I have used my own files for passwd.txt and shadow.txt
• I have used basic encryption technique
• I have added the basic features of adduser(as shown in the pdf issued regarding the details of the project)