exec 9>> "$lockfile" && [[ $({ fuser -f "$lockfile"; } 2>&- 9>&-) == $$ ]] || exit
while [1=1];
do:
d=$(date if (( t2 - t1 > 8*60*60 ))') t=$(< timestamp); if ((d > t)); then date +%s >| timestamp; echo 'take this dir'; else continue;
date +%s > timestamp