Written for Python 2.6

#!/usr/bin/python

import ftplib

ftp = ftplib.FTP("ftp.server.com")
ftp.login("username", "password")
ftp.cwd("path/path")

data = []

ftp.dir(data.append)

ftp.quit()

outputFile = open('dirList.txt','wb')

for line in data:
    outputFile.write(line + "\n")

outputFile.close()

Python can be used on Window, Linux and Mac. It just a simple install.

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#!/usr/bin/python

import string
import os
import re

# task:
# loop thur input directory
# look for .pdf
# replace space with underscore
# rename/move to output directory

inputDir = "./" # Current directory
outputDir = "./new_location"

for filename in os.listdir(inputDir):
    if filename[-4:] == ".pdf":
        tempName = filename
        tempName = tempName.replace(' ', '_')
        os.rename(inputDir + "/" + filename, outputDir + "/" + tempName)