vsftp-addpasswd.sh

#!/bin/bash

#Update file location to your needs/setup - assumes root access needed:
FILE=/etc/vsftpd/vsftpd-virt-htpasswds

#some checks
if [ "$EUID" -ne 0 ]
  then echo "Please run this script as root or use sudo. Exiting."
  exit
fi

if [ -z "$1" ] || [ -z "$2" ]; then
echo
echo "You have not entered a needed option."
echo "Usage:"
echo
echo "vsftp-passwd {ftp username} {ftp password}"
echo
echo "Exiting."
echo
exit
fi

if [ ! -e "$FILE" ] ; then
    touch "$FILE"
fi

#command line tokens passed
USER=$1
PASS=$2

#exec it

htpasswd -p -b $FILE $USER $(openssl passwd -1 -noverify $PASS) &>/dev/null
if [ $? -eq 0 ]; then
    echo "Command Succeeded."
else
    echo "Command Failed!"
fi