force logoff a linux user

sudo pkill -9 -u someuser

download chinese font for the browser in a fresh ubuntu

eg.文泉 (ttc)
apt-get ttf-wqy-zenhei

Mac - create a ram disk in OS X Mountain Lion

Reasons:

1. I have many Ram
2. SSD has limited write cycles
3. Fast read/write in ramdisk: good for BT, compilation, zip/unzip, encoding/decoding, etc.


How?

// copy and paste the following into a“create_ramdisk.scpt”, and run this apple script

do shell script "
if ! test -e /Volume/\"ramdisk\" ; then
diskutil erasevolume HFS+ \"ramdisk\" `hdiutil attach -nomount ram://4629672`
fi
"