File Growth Watcher

growmon.sh

#!/usr/bin/bash
# oxagast / [email protected]
if [[ $# -eq 1 ]] || [[ $# -eq 2 ]]; then
  if [[ $# -eq 1 ]]; then
    ESIZE=1000000000000000000;
  fi
  if [[ $# -eq 2 ]]; then
    ESIZE=$2;
  fi
  while test -s $1 && [[ $ESIZE -ge $(stat --printf "%s" $1) ]]; do
    stat --printf "%s" $1 | numfmt --to-unit M --format "%.2f" | xargs printf "\rSize: %8.2fmb      | $1"
    sleep 0.3 ;
  done  
else
  echo "useage: $0 [filename] [target size in bytes]";
fi