#!/bin/bash


use strict;
use warnings;
use diagnostics;

# Login credentials

user='*****' #Do not forget to enclose inside single or double quotes

pass='*****'

directory='Remoredirectory'

host='RemoteIP'



# Set time

# perl -e 'print time' will return the current time in Unix epoch format

# So if you substract 43200, that should give you the current time minus 30 minutes in Unix epoch format:

time=$(perl -e 'print time-43200')



# Connect to host and download the listing of the remote directory

ftp -n $host <<END_GET_LIST

        quote USER $user

        quote PASS $pass

        cd $directory

        ls -l /Localdirectory/ftpList.txt

        quit

END_GET_LIST

# Disconnect from remote host



# Save the 6th, 7th, and 8th field of the directory listing (i.e. Aug 15 5:15) of each line into file Dates.txt

awk -F ' ' '{print $6,$7,$8}'/Localdirectory/ftpList.txt > /Localdirectory/'Dates.txt'



# Save the 9th field of the directory listing (file name) of each line into file Files.txt

awk -F ' ' '{print $9}' /Localdirectory/ftpList.txt > /Localdirectory/'Files.txt'



linenum=0 #Auxiliary variable for sed.



while read list; do

        linenum=$((linenum+1))

        #Convert the modification datetime of each file to Unix's epoch

        epoch=$(perl -MFile::stat -e "print stat('$list')->mtime")

        if [ $epoch -gt $time ] ; then

                file=$(sed -n "${linenum}p" Files.txt)  #If the condition is satisfied, use sed to get the name of the file

                 #in the same line of Files.txt.

#Connect again and download file when the condition above has been satisfied.

                ftp -n $host <<END_RETRIEVE

                        quote USER $user

                        quote PASS $pass

                        cd $directory

                        binary
                        
                        get $file

                        quit

END_RETRIEVE

        fi

done < /Localdirectory/'Dates.txt'