change_ftp_password.sh

#!/bin/bash

FTP_USER="$1";
FTP_PASSWORD="$2";
FTP_PASSWD_FILE="/etc/pure-ftpd/pureftpd.passwd";

CHECK_LOGIN=$(cat "$FTP_PASSWD_FILE" | grep "$FTP_USER:" | cut -d ':' -f 1 | wc -l);

DieWithError()
{
    echo "$1" 1>&2;
    exit 1;
}

[ -z "$FTP_USER"     ]  && DieWithError "Usage: $0 <ftp_login> <ftp_password>";
[ -z "$FTP_PASSWORD" ]  && DieWithError "Usage: $0 <ftp_login> <ftp_password>";
[ $CHECK_LOGIN -eq 0 ]  && DieWithError "Error: the specified login does not exist";

echo -e "${FTP_PASSWORD}\n${FTP_PASSWORD}\n" | pure-pw passwd "${FTP_USER}" &> /dev/null;

pure-pw mkdb > /dev/null 2>&1;

/etc/init.d/pure-ftpd restart > /dev/null 2>&1;

echo -e "Done!\n";

exit 0;