alias msql='mysql -h 127.0.0.1 -u root -pa'alias msqld='/opt/odp/share/mysql/mysql.server'
sudo tar cvpjf backup.tar.bz2 --exclude=/proc --exclude=/lost+found --exclude=/backup.tar.bz2 --exclude=/mnt --exclude=/sys --exclude=/data --exclude=/opt --exclude=/home/ak/work /sudo tar x
，"硬中断是外部设备对CPU的中断"，"软中断通常是硬中断服务程序对内核的中断"，"信号则是由内核（或其他进程）对某个进程的中断"（《Linux内核源代码情景分析》第三章）。
make O=/root/kernel modulesmake O=/root/kernel modules_install INSTALL crypto/crc32c.ko INSTALL crypto/hmac.ko INSTALL crypto/sha1_generic.ko INSTALL drivers/acpi/button.ko&nbs
man update-rc.dsudo update-rc.d service-name defaults #service-name must exist in /etc/init.d/sudo update-rc.d -f service-name remove
centos install: #!/bin/bash cd apr-1.5.1 ./configure --prefix=/opt/apache2/apr-1.5.1 make sudo make install make clean cd ../apr-util-1.5.3 ./conf
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