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#!/bin/bash

username="username"
password="unecessary if you have keyfile auth setup"
host="IP address"
port="port#"
base_name="$(basename "$0")"
lock_file="/tmp/$base_name.lock"

trap "rm -f $lock_file; exit" INT TERM

if [ -e "$lock_file" ]
then
    echo "$base_name is running already."
    exit
else
    touch "$lock_file"
    /usr/bin/lftp -p "$port" -u "$username","$password" sftp://"$host" << EOF
    mirror --use-pget-n=20 -P 5 /remote/path /local/path
    quit
EOF
    rm "$lock_file"
    exit
fi