How to code script for transferring filr from unix to some remote server.

#!/usr/bin/ksh

#-- Set variables
FILE=$1                              # the first parameter on the command line
CURRDATE=`date +%Y%m%d`
REMOTENODE=node_to_ftp_file_to
USERNAME=unix_account_on_remote_node
PASSWORD=password_of_unix_account
DESTDIR=destination_directory_for_file

#-- Check a file has been passed as a parameter to this script
if [[ -z "${FILE}" ]]; then
  echo ERROR: file to process not passed
  exit 10
fi

#-- Check the file exists
if [[ ! -f ${FILE} ]]; then 
  echo ERROR: ${FILE} does not exist or is not a regular file
  exit 20
fi

#-- Rename file
mv ${FILE} ${FILE}.${CURRDATE}

#-- Get the filename of the FILE
FILENAME=`basename ${FILE}`

#-- Ftp the file
ftp <<END_OF_FTP
open ${REMOTENODE}
quote user ${USERNAME}
quote pass ${PASSWORD}
hash
put ${FILE} ${DESTDIR}/${FILENAME}
dir ${DESTDIR}/${FILENAME}
bye
END_OF_FTP

exit