Ubuntu 13.04优化设置

快捷命令：

选择窗体强制关闭进程：

xkill

截图：

gnome-screenshot -a

查询内存：

free -m

设置自动清理内存：

echo 3 > /proc/sys/vm/drop_caches

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官方说明：

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
To free pagecache:

• echo 1 > /proc/sys/vm/drop_caches
  To free dentries and inodes:
• echo 2 > /proc/sys/vm/drop_caches
  To free pagecache, dentries and inodes:
• echo 3 > /proc/sys/vm/drop_caches
  As this is a non-destructive operation, and dirty objects are notfreeable, the user should run “sync” first in order to make sure allcached objects are freed.

This tunable was added in 2.6.16.