linux_ugmfunctions.sh

#!/bin/bash

. ScriptSettings.sh

thedate=$(date)

#add user
function aduser {
  read -p 'Would you like to add a user? [y/n] : ' aduseryn
  if [[ ${aduseryn} = 'y' ]]; then
  	aduser=1
  	while [[ ${aduser} = 1 ]]; do
  	  read -p 'What would you like to name this new user? : ' name
  	  read -p 'Is this user an Admin? [y/n] : ' adminyn
  	  if [[ ${adminyn} = 'y' ]]; then
        sudo adduser --force-badname ${name}
  	    sudo usermod -a -G sudo ${name}		#adds user to sudo group
        sudo usermod -a -G adm ${name}   #adds user to admin group
  	    echo "User ${name} has been created and has been added to admin and sudo groups"
  	    echo "User ${name} has been created and has been added to admin and sudo groups  | ${thedate}" >> Script_log.txt
  	  else
  		sudo useradd ${name}
  		echo "User ${name} has been added!"
  		echo "User ${name} has been added!  | ${thedate}" >> Script_log.txt
  	  fi
  	  read -p 'Would you like to add another user? [y/n] : ' aga
  	  if [[ ${aga} = 'n' ]]; then
  	  	${aduser}=0
  	  fi
  	done
  	sleep 1s
  else
  	usr_gru
  fi
}

#remove users
function rmuser {
  read -p 'Would you like to remove a user from this system? [y/n] : ' rmuseryn
  if [[ ${rmuseryn} = 'y' ]]; then
	rmuser=1
	while [[ ${rmuser} = 1 ]]; do
	  cat /etc/passwd | grep "/home" | cut -d":" -f1
      read -p 'Which user would you like to remove from the system? : ' name
      userdel -r ${name}
      echo "User ${name} has been removed from this system!  | ${thedate}" | tee Script_log.txt
      read -p 'Would you like to remove another user from this system? [y/n] : ' aga
      if [[ ${aga} = 'n' ]]; then
        $rmuseryn=0
      fi
    done
  else
    usr_gru
  fi
}

#list users
function lsusrs {
  cat /etc/passwd | grep "/home" | cut -d":" -f1
  read -p 'Press Enter to continue...'
}

#list groups
function lsgrus {
  getent group | cut -d: -f1 #prints out groups to screen
  read -p 'Press Enter to continue...'
}

#add user to group
function usrtogru {
  read -p 'Would you like to add a user to a group? [y/n] : ' usrtogruyn
  if [[ ${usrtogruyn} = 'y' ]]; then
    usrtogru=1
    while [[ ${usrtogru} = 1 ]]; do
      cat /etc/passwd | grep "/home" | cut -d":" -f1
      read -p 'Which user would you like to add to a group? : ' name
      getent group | cut -d: -f1
      read -p 'Which group would you like to add user ${name} to? : ' group
      sudo usermod -a -G ${group} ${name}
      echo "User ${name} has been added to group ${group}  | ${thedate}" | tee Script_log.txt  #prints to screen and log file
      read -p 'Would you like to add another user to another group? [y/n] : ' aga
      if [[ ${aga} = 'n' ]]; then
        usrtogru=0
      fi
    done
  else
    usr_gru
  fi
}

#creat group
function crtgru {
  read -p 'Would you like to create a new group? [y/n] : ' crtgruyn
  if [[ ${crtgruyn} = 'y' ]]; then
    crtgru=1
    while [[ ${crtgru} = 1 ]]; do
      read -p 'What would you like to name the new group? : ' name
      sudo groupadd ${name}
      echo "The new group called ${name} has been created!  | ${thedate}" | tee Script_log.txt
      echo ""
      read -p 'Would you like to create another group? [y/n] : ' aga
      if [[ ${aga} = 'n' ]]; then
        crtgru=0
      fi
    done
  else
    usr_gru
  fi
}

#remove group
function rmgru {
  read -p 'Would you like to delete a group? [y/n] : ' rmgruyn
  if [[ ${rmgruyn} = 'y' ]]; then
    rmgru=1
    while [[ ${rmgru} = 1 ]]; do
      getent group | cut -d: -f1 #prints out groups to screen
      read -p 'What group would you like to remove from the system? : ' name
      sudo groupdel ${name}
      echo "The group called ${name} has been removed from the system!  | ${thedate}" | tee Script_log.txt
      echo ""
      read -p 'Would you like to remove another user from the system? [y/n] : ' aga
      if [[ ${aga} = 'n' ]]; then
        rmgru=0
      fi
    done
  else
    usr_gru
  fi
}

#remove user from group
function rmfrogru {
  read -p 'Would you like to remove a user from a group? [y/n] : ' rmfrogruyn
  if [[ ${rmfrogruyn} = 'y' ]]; then
    rmfrogru=1
    while [[ ${rmfrogru} = 1 ]]; do
      cat /etc/passwd | grep "/home" | cut -d":" -f1
      read -p 'Which user would you like to remove from a group? : ' name
      getent group | cut -d: -f1
      read -p 'Which group would you like to remove the user from? : ' gruname
      gpasswd -d ${name} ${gruname}
      echo "User ${name} has been removed from group ${gruname}!  | ${thedate}" | tee Script_log.txt
      read -p 'Would you like to remove another user from another group? [y/n] : ' aga
      if [[ ${aga} = 'n' ]]; then
        rmfrogru=0
      fi
    done
  else
    usr_gru
  fi
}

#find out what groups a specific user is in
function usrgrumem {
  read -p 'Would you like to see what groups a specific user is in? [y/n] : ' usrgrumemyn
  if [[ ${usrgrumemyn} = 'y' ]]; then
    read -p 'What is the name of the user that you want to know the groups of? : ' name
    groups $name
  else
    usr_gru
  fi
}

#find out the members of a group
function grumem {
  read -p 'Would you like to see what members are in a specific group? [y/n] : ' grumemyn
  if [[ ${grumemyn} = 'y' ]]; then
    getent group | cut -d: -f1
    read -p 'What group would you like to see the members of? : ' gruname
    grep -i --color ${gruname} /etc/group
  else
    usr_gru
  fi
}

#change all users passwords
function chpaswdall {
  read -p 'Would you like to change all of the passwords for the users? [y/n] : ' chpaswdallyn
  if [[ ${chpaswdallyn} = 'y' ]]; then
    userlist=( $(eval getent passwd {$(awk '/^UID_MIN/ {print $2}' /etc/login.defs)..$(awk '/^UID_MAX/ {print $2}' /etc/login.defs)} | cut -d: -f1) )
    echo ${userlist[@]}
    usersleft=${#userlist[@]}  #this variable is equivelent to the number of users in list $userlist
    echo ${usersleft}
    read -p 'What would you like the new passwords to be? : ' newpasswd
    i=0
    while [[ ${usersleft} != 0 ]]; do
      sudo echo "${userlist[$i]}:${newpasswd}" | sudo chpasswd
      echo "User ${userlist[$i]} password has been changed successfully!" | tee Script_log.txt
      let i=i+1
      echo ${i}
      let usersleft=usersleft-1
      echo ${usersleft}
      sleep 0.5s
    done
    echo "${userslist[@]} all users except for the currently logged in user, have had their passwords changed to ${newpasswd}!"
    echo "All passwords for all users have been changed except the account you are currently logged in as.  | ${thedate}" | tee Script_log.txt
    sleep 1s
  else
    usr_gru
  fi
}