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@bijoy26
Last active June 7, 2021 07:47
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Create a new Debian based non-root user with specified group
#!/bin/bash
#####################################
# File: spawn_user.sh
# Description: Create a new Debian based non-root user with specified group
# Created: Thursday, 2nd June 2021
# Author: Anjum Rashid
# -----
# Last Modified: Tuesday, Thursday, 3rd June 2021
# -----
#####################################
# make sure to run script as root or sudoer (sudo ./spawn_user.sh)
function collectUserInfo() {
echo "Enter new username:"
read username
checkExistingUser
echo "Enter new password:"
read password
echo "Enter groupname (existing) to assign:"
read group
checkExistingGroup
}
function checkExistingUser(){
# check if 'id' finds a user or not
# 'id -u username' displays the uid only. '$?' contains the return status (0 or 1)
status_code=$(id -u "$username" &>/dev/null; echo $?)
if [[ $status_code -eq 1 ]] ; then
echo 'Cool choice!'
else
echo 'User already exists. Try again with a different username'
exit $status_code
fi
}
function checkExistingGroup(){
# 'grep group /etc/group' displays matching group info
status_code_grp=$(grep -q $group /etc/group; echo $?)
if [[ $status_code_grp -eq 1 ]] ; then
echo "Group "$group" does not exist. Try again with an existing group"
exit $status_code_grp
else
echo ""$group" group selected for assignment."
fi
}
function setupNewUser() {
echo -e "\n################## STATUS LOG ##################\n"
# add new user, set group, create new home directory
useradd -G $group -m $username
echo "new user $username created and user group $group assigned!"
# update new user password by piping from STDIN
echo ""$username":"$password"" | chpasswd
echo "user password for $username is set!"
# change the default user shell to bash
chsh -s /bin/bash $username
echo "user $username shell updated to bash!"
}
function verifyUser() {
echo -e "\n################## NEW ENTRIES ##################\n"
echo -e "User entry (etc/passwd):\n\n\t$(grep "$username" /etc/passwd)\n"
echo -e "Password entry (etc/shadow):\n\n\t$(grep "$username" /etc/shadow)\n"
echo -e "Group entry (etc/group):\n\n\t$(grep "$group" /etc/group)\n"
}
collectUserInfo
setupNewUser
verifyUser
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