Synchronize a local path with a remote path

sync_dir

#!/bin/bash

if [[ $# -ne 5 ]]; then
    echo -e "\nUsage: sync [SSH KEY PATH] [SSH_USER] [REMOTE HOST] [LOCAL DIR/FILE] [REMOTE DIR/FILE]\n"
    exit 1
fi

if [[ ! -e $4 ]]; then
    echo -e "\nError: '$4' does not exist."
    exit 1
fi

ssh_key=$1
ssh_user=$2
ssh_host=$2@$3

src=$(cd $(dirname $4) && pwd)/$(basename $4)
if [[ -z $5 ]]; then
    tgt='~'
else
    tgt=$5
fi

function s() {
    /usr/bin/ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i $ssh_key $@ 
}

function sync() {
    rsync -avz -e "ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i $ssh_key" --progress $@
}

s $ssh_host "mkdir -p $tgt"
while true; do
    clear
    sync $src $ssh_host:$tgt
    sleep 1
done