忘了不少东西，无奈写个Blog Backup:
Linux基本命令：
who查看当前user
ps aux (我经常多一个‘-’，有一行错误信息)
netstat (具体man or info to CC)
shutdown reboot关机命令
shutdown语法：
/sbin/shutdown[-t秒][-arkhncfF时间][警告信息]
eg:
/sbin/shutdown -h 10 'Server will be shutdowned after 10 mins'
man下的参数：
OPTIONS
-r Requests that the system be rebooted after it has been brought down.
-h Requests that the system be either halted or powered off after it has
been brought down, with the choice as to which left up to the system.
-H Requests that the system be halted after it has been brought down.
-P Requests that the system be powered off after it has been brought down.
-c Cancels a running shutdown. TIME is not specified with this option, the
first argument is MESSAGE.
-k Only send out the warning messages and disable logins, do not actually
bring the system down.
eg:
shutdown -h now/0
shutdown -h 10:00 /*10点关机
shutdown -h +10 10mins后关机
shutdown -r now (reboot at once)
shutdown -r +30 'System will reboot in 30mins'
shutdown -k 'System will reboot'(发送警告信息)
reboot命令
shutdown -r now几乎与reboot相同，关机之前输入回填指令：
sync;sync;sync;reboot
fsck - check and repair a Linux file system
fsck /dev/hda7:
To clear the wrong disk block of /dev/hda7 (单人单机模式root)
