To Save MacBookAir SSD

ramdisk.sh

#!/bin/sh

SIZE=262144
MOUNT_POINT=/Volumes/ramdisk
RAM_DISK=`hdid -nomount ram://$SIZE`

newfs_hfs -v ramdisk $RAM_DISK
mkdir -p $MOUNT_POINT
mount -t hfs $RAM_DISK $MOUNT_POINT
chmod 0777 $MOUNT_POINT

CHROME_CACHE_DIR=/Users/tokuyama/Library/Caches/Google/Chrome/Default/Cache
rm -rf $CHROME_CACHE_DIR
ln -s $MOUNT_POINT $CHROME_CACHE_DIR

APACHE_LOG_DIR=/private/var/log/apache2
rm -rf $APACHE_LOG_DIR
ln -s $MOUNT_POINT $APACHE_LOG_DIR

# place this file into directory like /usr/local/bin
# then execute command like below
# sudo defaults write com.apple.loginwindow LoginHook /usr/local/bin/ramdisk.sh