CentOS 7 bash script to create vsftpd user

vsftpd_virtualuser_add.sh

#!/bin/bash

#------------------------------------------------------------------------------------
# Initialize some variables
#------------------------------------------------------------------------------------
SHELL=/sbin/nologin
FTPCONF=/etc/vsftpd
HOMEDIR=/var/www


if [ -f $FTPCONF/password ];then
    ACCOUNTDB_TOTALLINES=`grep '.' -c $FTPCONF/password`
else
    ACCOUNTDB_TOTALLINES=0
fi

function checkNewUser_Existence () {
    C=1;

    if [ "$ACCOUNTDB_TOTALLINES" != "0" ];then
        while [ $C -lt $ACCOUNTDB_TOTALLINES ]; do
            VALIDUSER=`sed -n -e "$C p" $FTPCONF/password`
            if [ "$USERNAME" == "$VALIDUSER" ];then
                USERNAMEOK=NO
                break;
            else
                USERNAMEOK=YES
           fi
           let C=$C+2;
        done
    fi
}

function checkNewUser_Availability () {

    if [ -f $FTPCONF/denied_users ];then
        if [ ! `grep -w $USERNAME $FTPCONF/denied_users` ];then
            USERNAMEOK=YES
    else
        USERNAMEOK=NO
        fi

    else
        USERNAMEOK=NO
    fi
}

function checkNewUser_Homedir () {

    # Verify User's Home Directory.
    if [ -d $HOMEDIR ];then
        for i in `ls $HOMEDIR/`; do
           VALIDUSER=$i
           if [ "$USERNAME" == "$VALIDUSER" ];then
               USERNAMEOK=NO
           break;
       else
           USENAMEOK=YES
           fi
        done
    fi
}

function getUsername () {

    printf " Enter Username (lowercase)      : "
    read USERNAME

    checkNewUser_Existence;
    checkNewUser_Availability;
    checkNewUser_Homedir;

    if [ "$USERNAMEOK" == "NO" ];then
        echo "  --> Invalid ftp virtual user. Try another username."
        getUsername;
    fi

}

#------------------------------------------------------------------------------------
# Add some presentation :)
#------------------------------------------------------------------------------------
clear;
echo '-------------------------------------------------------------------'
echo " vsftpd -> Virtual Users -> Add Virtual User"
echo '-------------------------------------------------------------------'

# Check dependencies
PACKISMISSING=""
PACKDEPENDENCIES="vsftpd libdb4-utils"
for i in `echo $PACKDEPENDENCIES`; do
    /bin/rpm -q $i > /dev/null
    if [ "$?" != "0" ];then
        PACKISMISSING="$PACKISMISSING $i"
    fi
done
if [ "$PACKISMISSING" != "" ];then
    echo " ATTENTION: The following package(s) are needed by this script:"
    for i in `echo $PACKISMISSING`; do
        echo "             - $i"
    done
    echo '-------------------------------------------------------------------'
    exit;
fi


#
# Get user information
#
getUsername;
printf " Enter Password (case sensitive) : "
read PASSWORD
printf " Enter Comment(user's full name) : "
read FULLNAME
printf " Account disabled ? (y/N)        : "
read USERSTATUS
echo " Home directory location         : ${HOMEDIR}/$USERNAME "
echo " Home directory permissions      : $USERNAME.$USERNAME | 750 | public_content_rw_t"
echo " Login Shell                     : $SHELL "

#
# Create specific user configuration
#
echo "dirlist_enable=YES
download_enable=YES
local_root=/var/www/$USER
write_enable=YES" > /etc/vsftpd/user_conf/$USERNAME

#
# Update denied_users file
#
if [ "$USERSTATUS" == "y" ];then
    echo $USERNAME >> $FTPCONF/denied_users
else
    sed -i -r -e "/^$USERNAME$/ d" $FTPCONF/denied_users
fi

#Create user
echo $USERNAME | tee /etc/vsftpd/password{,-nocrypt} > /dev/null

#Update password.db file
mypass=$PASSWORD
echo $mypass >> /etc/vsftpd/password-nocrypt
echo $(openssl passwd -crypt $mypass) >> /etc/vsftpd/password
db_load -T -t hash -f $FTPCONF/password $FTPCONF/password.db

# Create ftp virtual user $HOMEDIR
if [ ! -d $HOMEDIR  ];then
    mkdir $HOMEDIR
fi


# Create home directory
mkdir -p $HOMEDIR/$USERNAME

# Set Permissions
chmod 600 $FTPCONF/password.db
chmod 750 $HOMEDIR/$USERNAME
chown -R vsftpd:vsftpd $HOMEDIR


# Restart vsftpd after user addition.
echo '-------------------------------------------------------------------'
/sbin/service vsftpd reload
echo '-------------------------------------------------------------------'