./clearcache.sh < 1 | 2 | 3 >

clearcache.sh

#!/bin/bash
# Note, we are using "echo 3", but it is not recommended in production instead use "echo 1"

LEVEL=${1:-1}  # If variable not set or null, use "1".
shift $(( $# > 0 ? 1 : 0 ))

# Check LEVEL is invalid then set to default "1"
if [ "$LEVEL" -gt 3 ]; then
  LEVEL=1
fi


# 1 - Free pagecache, dentries and inodes in cache memory
# 2 - Free dentries and inodes use following command
# 3 - Free pagecache only use following command
echo "echo $LEVEL > /proc/sys/vm/drop_caches"
exit 0

# Clear Linux Memory Buffer Cache
0 17 * * FRI /usr/local/bin/clearcache.sh