linux, ubuntu emergency safe reboot

http://en.wikipedia.org/wiki/Magic_SysRq_key#.E2.80.9CREISUB.E2.80.9D_.E2.80.93_safe_reboot
“REISUB” – safe reboot

unRaw (take control of keyboard back from X),
tErminate (send SIGTERM to all processes, allowing them to terminate gracefully),
kIll (send SIGKILL to all processes, forcing them to terminate immediately),
Sync (flush hd write-cache data to disk),
Unmount (remount all filesystems read-only),
reBoot.

vim 只删除,不剪切

See main article Vim In Case Of.

nmap DD “_dd

将删除的内容放入 black hole register: ”_ 中

_"dd 就可以将当前行内容删除并且不会放在任何寄存器中。

http://forum.ubuntu.org.cn/viewtopic.php?f=68&t=84593?f=68&t=84593)

卸载 ubuntu11.10 unity 的 卸载即现式滚动条 和 所谓的 全局菜单, 恢复滚动条

卸载即现式滚动条和全局菜单，找回经典的滚动条和菜单。

sudo apt-get remove overlay-scrollbar liboverlay-scrollbar3-0.2-0 liboverlay-scrollbar-0.2-0

sudo apt-get remove indicator-appmenu appmenu-gtk appmenu-gtk3 appmenu-qt

from:http://tieba.baidu.com/p/1328489583