Simple bash log rotate script

log_rotate.sh

#!/bin/bash
checkSizeOver() {
  typeset -i LFSB LFSM LOG_SIZE=10
  LF=$1
  LOG_SIZE=$2
  LFSB=$(stat -c "%s" $LF)
  # This is bytes - turn into MB, base 2}
  LFSM=${LFSB}/1048576
  # This is bytes - turn into MB, base 2
  if [ $LFSM -gt $LOG_SIZE ]
    then
      return 0
    else
      return 1
  fi
}

LOG_PATH=$1
OLD_LOG_PATH=$2
for file in $LOG_PATH/*.log
do
  SIZE=10
  NAME=$(basename $file)
  now="$(date +'%Y-%m-%d_%H-%m')"
  if checkSizeOver $file $SIZE;
    then
      DEST=$OLD_LOG_PATH/$NAME.$now
      mv $file $DEST
      echo Logfile $file is greater than $SIZE MB
    else
      echo Logfile $file is less than $SIZE MB
  fi
done