Stay in (r)Sync - https://loopy-linux.de/auto-sync-script/

README.md

I wrote this script to keep a file or a folder in sync local or remotely. This worked out very well to sync changes in the code to a remote server in seconds without touching any button on my keyboard. The method to check if anything has changed is even simpler. It checks the file or folder last change date 'ls --full-time'.

Set the variable path to a directory or file. This could be a remote path aswell.

FP_rsync_from='/folder/from'
FP_rsync_to='/folder/to'

#REMOTE
[user]@[remote server]:[remote path]
FP_rsync_from='argonqq@10.10.158.10:/folder/from'
FP_rsync_to='root@10.10.158.11:/folder/to'

After you've started the script it will sync a first time. Now it will only sync if anything changes.

Super Simple rsync Loop Bash Script

#!/bin/bash

#rsync_filepath
FP_rsync_from='/folder/from'
FP_rsync_to='/folder/to'

platform='unknown'
unamestr=$(uname)

# Linux
if [ "$unamestr" == 'Linux' ]; then

  printf "\nYour system is $unamestr based.\n"
  while true
  do
    lastchanged_before=$(ls --full-time $FP_rsync_from  | awk '{print $6, $7}')
    if [ "$lastchanged_before" != "$lastchanged_after" ]; then
      echo; date; echo; rsync -avh $FP_rsync_from $FP_rsync_to
      lastchanged_after=$lastchanged_before
    fi
    sleep 3
  done
fi

#OS X
if [ "$unamestr" == 'Darwin' ]; then

  echo; echo "Your system is $unamestr based."; echo;
  while true
  do
    lastchanged_before=$(ls -alT $FP_rsync_from  | awk '{print $8}')
    if [ "$lastchanged_before" != "$lastchanged_after" ]; then
      echo; date; echo; rsync -avh $FP_rsync_from $FP_rsync_to
      lastchanged_after=$lastchanged_before
    fi
    sleep 3
  done
fi

unset unamestr
unset lastchanged_before
unset lastchanged_after
unset platform
unset FP_rsync_from
unset FP_rsync_to