UNIX - A simple script to rotate log files

rotatelog.sh

## The following is a simple script to rotate log files. Schedule it using crontab to regularly 
## rotate log files. 
## The script works by backing up the target log file (using cp) and then emptying it out.
## Usage: 
## ./rotatelog.sh <<file name>>
## License MIT


DATESTAMP=`date +'%Y%m%d-%H%M'`
BACKUP_LOG_FILE=backup.$DATESTAMP.log

# Is 1st argument passed? 
if [[ -z $1 ]]
then
	echo "First argument must be the file path"
	exit 0
else
	LOG_FILE=$1
fi


## Is the 1st argument a valid file path?
if [[ -e $LOG_FILE ]]
then
	echo "File exist"
	echo "Backing up....."
else
	echo "File does not exist"
	exit 0
fi


cp $LOG_FILE $BACKUP_LOG_FILE
cat /dev/null > $LOG_FILE
echo "Backup Complete!"