lec5vid4Project

#!/bin/bash
#
# this script creates a new user on the local system 
# this script takes username as an argument to the script 
# optionally , you can also provide a comment as an argument for the account 
# password will be automatically genrated for the account 
# username , password , host will be displayed 
# script will conform to Linux program standard conventions.
# conform to standard UNIX/Linux program conventions. Namely, sending errors to STDERR.

# make sure the script run with super user privilages 
if [ $UID -ne 0 ]
then 
   echo "please run the script as root" >&2 # >&2 same as 1>&2
   exit 1
fi

# if they don't supply atleast one argument , then give them help 
if [ $# -lt 1 ]
then 
   echo " usage ${0} USER_NAME [COMMENT] .. " >&2
   exit 1
fi

# the first parameter is the username 
USER_NAME="${1}"

# the rest parameter is comment
shift 
COMMENT="${@}"

# Generate a password 
PASSWORD=$(date +%s%N$RANDOM | sha256sum | head -c48)   

# Create the user with the password 
useradd -c "${COMMENT}" -m $USER_NAME &> /dev/null

# Check to see if the useradd command succeded
# we dont want to tell the user that the account is created even if it was not created
if [ $? -ne 0 ]
then 
   echo 'the account could not be created' >&2
   exit 1
fi

# SET the password 
echo $PASSWORD | passwd --stdin ${USER_NAME} &> /dev/null

# Check to see if the passwd comamnd succeded 
if [ $? -ne 0 ]
then 
   echo 'the password could not be set' >&2
   exit 1
fi

# force passwrd change on the first login 
passwd -e $USER_NAME &> /dev/null

# Display the username, password, and the host where the user was created.
echo # leaves a blank space
echo 'username'
echo "${USER_NAME}"
echo
echo 'password'
echo "${PASSWORD}"
echo 
echo 'Host'
echo "${HOSTNAME}"

exit 0