[Linux] 學習筆記第一篇——安裝

環境：CentOS6.3 minimal

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1、下載

鏡像地址：http://mirrors.stuhome.net/centos/6.3/isos/x86_64/
CentOS-6.3-x86_64-netinstall.iso
CentOS-6.3-x86_64-minimal.iso
CentOS-6.3-x86_64-bin-DVD1.iso
CentOS-6.3-x86_64-bin-DVD2.iso
CentOS-6.3-x86_64-LiveCD.iso
CentOS-6.3-x86_64-LiveDVD.iso
2、安裝

安裝環境：Oracle VM VirtualBox 4.2.6
3、登出、關機和重啟登出

$ logout
$ Ctrl + D
關機

$ poweroff
重啟

$ reboot

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註：shutdown命令可以關閉所有程式，依照使用者的需要，重新啟動或關機。
1、立即關機：-h 參數讓系統立即關機。範例如下:
$ shutdown –h now ← 要求系統立即關機
2、指定關機時間：time 參數可指定關機的時間，或設定多久時間後運行shutdown命令，範例如下:
$ shutdown now ← 立刻關機
$ shutdown +5 ← 5分鐘後關機
$ shutdown 10:30 ← 在10:30時關機
3、關機後自動重啟:-r 參數設定關機後重新啟動。範例如下:
$ shutdown -r now ← 立刻關閉系統並重啟
$ shutdown -r 23:59 ← 指定在23:59時重啟動

Usage: shutdown [OPTION]... TIME [MESSAGE]
Bring the system down.

Options:
  -r                          reboot after shutdown
  -h                          halt or power off after shutdown
  -H                          halt after shutdown (implies -h)
  -P                          power off after shutdown (implies -h)
  -c                          cancel a running shutdown
  -k                          only send warnings, don't shutdown
  -q, --quiet                 reduce output to errors only
  -v, --verbose               increase output to include informational messages
      --help                  display this help and exit
      --version               output version information and exit

TIME may have different formats, the most common is simply the word 'now' which
will bring the system down immediately.  Other valid formats are +m, where m is
the number of minutes to wait until shutting down and hh:mm which specifies the
time on the 24hr clock.