Continuous rsync script

A shell script that keeps running rsync in a loop until a file is created to stop it. Obviously not the right way to do such things, but good enough for a quickie.

#!/bin/sh
                                                                                                      
while :
do
    if [ -f '/tmp/stoprsync' ]; then
        echo `date` >> /tmp/stoprsync
        printf 'found /tmp/stoprsync, exiting now\n'
        exit
    fi
    rsync -avP --stats remote_host::rsync_module /local/dir >> rsyncloop.log
    printf "exit code: $?\n\n" >> rsyncloop.log
    TRANSFERED=`tail -n 15 rsyncloop.log | grep "files\ transferred" | sed 's/^.*\:\ //'` 
    printf "TRANSFERED: $TRANSFERED.\n"
    if [ "$TRANSFERED" == 0 ]; then
        # nothing was transfered the last run, sleep for 5 minutes
        sleep 300
    else
        # no stress
        sleep 3
    fi
done

Create /tmp/stoprsync to stop it. rsync --status is needed in order to check if any files were transferred the previous run.