Initializes users and its public keys in localhost (Centos 7.5)

initial-config.sh

#!/bin/bash
# Initial config for users access

function validate_root {
 if [ "$USER" -ne "root" ]; then
  printf "WARN: this script is for root user\n"
 fi
}

function add_user {
 printf "\t Adding user: [$1]\n" && \
 useradd $1 && \
 usermod -aG wheel $1 && \
 usermod -aG docker $1 && \
 printf "\t Pushing authorized_keys ...\n" && \
 mkdir /home/$1/.ssh && \
 touch /home/$1/.ssh/authorized_keys && \
 cat $1.pub >> /home/$1/.ssh/authorized_keys && \
 chown -R $1 /home/$1/.ssh && \
 chmod 700 /home/$1/.ssh && \
 chmod 600 /home/$1/.ssh/authorized_keys && \
 printf "\t OK for: [$1]\n"
}

function scan_for_pubkeys {
 printf "Scanning this directory for *.pub files ...\n"
 for i in $( ls *.pub ); do
  suffix_idx=$(( ${#i} - 4 ))
  user=${i:0:$suffix_idx}
  add_user "$user"
 done
}

function disable_root_login {
 printf "Disabling SSH Root Login\n" && \
 printf "\n#Added by initial-config.sh\nPermitRootLogin no\n" >> /etc/ssh/sshd_config && \
 printf "Restarting SSH Daemon\n" && \
 systemctl restart sshd
}