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Linux Find Out Last System Reboot Time and Date Command
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======
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So, how do you find out your Linux or UNIX-like system was last rebooted? How do you display the system shutdown date and time? The last utility will either list the sessions of specified users, ttys, and hosts, in reverse time order, or list the users logged in at a specified date and time. Each line of output contains the user name, the tty from which the session was conducted, any hostname, the start and stop times for the session, and the duration of the session. To view Linux or Unix system reboot and shutdown date and time stamp using the following commands:
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* last command
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* who command
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### Use who command to find last system reboot time/date
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You need to use the [who command][1], to print who is logged on. It also displays the time of last system boot. Use the last command to display system reboot and shutdown date and time, run:
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`$ who -b`
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Sample outputs:
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```
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system boot 2017-06-20 17:41
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```
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Use the last command to display listing of last logged in users and system last reboot time and date, enter:
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`$ last reboot | less`
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Sample outputs:
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[![Fig.01: last command in action][2]][2]
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Or, better try:
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`$ last reboot | head -1`
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Sample outputs:
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```
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reboot system boot 4.9.0-3-amd64 Sat Jul 15 19:19 still running
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```
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The last command searches back through the file /var/log/wtmp and displays a list of all users logged in (and out) since that file was created. The pseudo user reboot logs in each time the system is rebooted. Thus last reboot command will show a log of all reboots since the log file was created.
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### Finding systems last shutdown date and time
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To display last shutdown date and time use the following command:
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`$ last -x|grep shutdown | head -1`
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Sample outputs:
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```
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shutdown system down 2.6.15.4 Sun Apr 30 13:31 - 15:08 (01:37)
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```
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Where,
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* **-x** : Display the system shutdown entries and run level changes.
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Here is another session from my last command:
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```
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$ last
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$ last -x
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$ last -x reboot
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$ last -x shutdown
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```
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Sample outputs:
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![Fig.01: How to view last Linux System Reboot Date/Time ][3]
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### Find out Linux system up since…
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Another option as suggested by readers in the comments section below is to run the following command:
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`$ uptime -s`
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Sample outputs:
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```
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2017-06-20 17:41:51
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```
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### OS X/Unix/FreeBSD find out last reboot and shutdown time command examples
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Type the following command:
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`$ last reboot`
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Sample outputs from OS X unix:
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```
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reboot ~ Fri Dec 18 23:58
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reboot ~ Mon Dec 14 09:54
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reboot ~ Wed Dec 9 23:21
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reboot ~ Tue Nov 17 21:52
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reboot ~ Tue Nov 17 06:01
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reboot ~ Wed Nov 11 12:14
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reboot ~ Sat Oct 31 13:40
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reboot ~ Wed Oct 28 15:56
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reboot ~ Wed Oct 28 11:35
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reboot ~ Tue Oct 27 00:00
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reboot ~ Sun Oct 18 17:28
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reboot ~ Sun Oct 18 17:11
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reboot ~ Mon Oct 5 09:35
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reboot ~ Sat Oct 3 18:57
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wtmp begins Sat Oct 3 18:57
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```
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To see shutdown date and time, enter:
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`$ last shutdown`
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Sample outputs:
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```
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shutdown ~ Fri Dec 18 23:57
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shutdown ~ Mon Dec 14 09:53
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shutdown ~ Wed Dec 9 23:20
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shutdown ~ Tue Nov 17 14:24
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shutdown ~ Mon Nov 16 21:15
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shutdown ~ Tue Nov 10 13:15
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shutdown ~ Sat Oct 31 13:40
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shutdown ~ Wed Oct 28 03:10
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shutdown ~ Sun Oct 18 17:27
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shutdown ~ Mon Oct 5 09:23
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wtmp begins Sat Oct 3 18:57
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```
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### How do I find who rebooted/shutdown the Linux box?
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You need [to enable psacct service and run the following command to see info][4] about executed commands including user name. Type the following [lastcomm command][5] to see
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```
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# lastcomm userNameHere
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# lastcomm commandNameHere
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# lastcomm | more
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# lastcomm reboot
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# lastcomm shutdown
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### OR see both reboot and shutdown time
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# lastcomm | egrep 'reboot|shutdown'
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```
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Sample outputs:
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```
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reboot S X root pts/0 0.00 secs Sun Dec 27 23:49
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shutdown S root pts/1 0.00 secs Sun Dec 27 23:45
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```
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So root user rebooted the box from 'pts/0' on Sun, Dec, 27th at 23:49 local time.
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### See also
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* For more information read last(1) and [learn how to use the tuptime command on Linux server to see the historical and statistical uptime][6].
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### about the author
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The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on [Twitter][7], [Facebook][8], [Google+][9].
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--------------------------------------------------------------------------------
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via: https://www.cyberciti.biz/tips/linux-last-reboot-time-and-date-find-out.html
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作者：[Vivek Gite][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.cyberciti.biz/
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[1]:https://www.cyberciti.biz/faq/unix-linux-who-command-examples-syntax-usage/ (See Linux/Unix who command examples for more info)
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[2]:https://www.cyberciti.biz/tips/wp-content/uploads/2006/04/last-reboot.jpg
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[3]:https://www.cyberciti.biz/media/new/tips/2006/04/check-last-time-system-was-rebooted.jpg
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[4]:https://www.cyberciti.biz/tips/howto-log-user-activity-using-process-accounting.html
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[5]:https://www.cyberciti.biz/faq/linux-unix-lastcomm-command-examples-usage-syntax/ (See Linux/Unix lastcomm command examples for more info)
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[6]:https://www.cyberciti.biz/hardware/howto-see-historical-statistical-uptime-on-linux-server/
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[7]:https://twitter.com/nixcraft
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[8]:https://facebook.com/nixcraft
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[9]:https://plus.google.com/+CybercitiBiz
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@ -0,0 +1,183 @@
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Linux 系统查询机器最近重新启动的日期和时间的命令
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======
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在你的 Linux 或 类 UNIX 系统中，你是如何查询系统重新启动的日期和时间？你是如何查询系统关机的日期和时间？ last 命令不仅可以按照时间从近到远的顺序列出指定的用户，终端和主机名，而且还可以列出指定日期和时间登录的用户。输出到终端的每一行都包括用户名，会话终端，主机名，会话开始和结束的时间，会话持续的时间。使用下面的命令来查看 Linux 或类 UNIX 系统重启和关机的时间和日期。
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- last 命令
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- who 命令
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### 使用 who 命令来查看系统重新启动的时间/日期
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你需要在终端使用 [who][1] 命令来打印有哪些人登陆了系统。who 命令同时也会显示上次系统启动的时间，使用 last 命令来查看系统重启和关机的日期和时间，运行：
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`$ who -b`
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示例输出：
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`system boot 2017-06-20 17:41`
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使用 last 命令来查询最近登陆到系统的用户和系统重启的时间和日期。输入：
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`$ last reboot | less`
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示例输出：
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[![Fig.01: last command in action][2]][2]
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或者，尝试输入：
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`$ last reboot | head -1`
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示例输出：
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```
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reboot system boot 4.9.0-3-amd64 Sat Jul 15 19:19 still running
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```
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last 命令通过查看文件 /var/log/wtmp 来显示自 wtmp 文件被创建时的所有登陆(和注销)的用户。每当系统重新启动时，伪用户将重启信息记录到日志。因此，`last reboot` 命令将会显示自日志文件被创建以来的所有重启信息。
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### 查看系统上次关机的时间和日期
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可以使用下面的命令来显示上次关机的日期和时间：
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`$ last -x|grep shutdown | head -1`
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示例输出：
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```
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shutdown system down 2.6.15.4 Sun Apr 30 13:31 - 15:08 (01:37)
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```
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命令中，
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* **-x**：显示系统开关机和运行等级改变信息
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这里是 last 命令的其它的一些选项：
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```
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$ last
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$ last -x
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$ last -x reboot
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$ last -x shutdown
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```
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示例输出：
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![Fig.01: How to view last Linux System Reboot Date/Time ][3]
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### 查看系统正常的运行时间
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评论区的读者建议的另一个命令如下：
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`$ uptime -s`
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示例输出：
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```
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2017-06-20 17:41:51
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```
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### OS X/Unix/FreeBSD 查看最近重启和关机时间的命令示例
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在终端输入下面的命令：
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`$ last reboot`
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在 OS X 示例输出结果如下：
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```
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reboot ~ Fri Dec 18 23:58
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reboot ~ Mon Dec 14 09:54
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reboot ~ Wed Dec 9 23:21
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reboot ~ Tue Nov 17 21:52
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reboot ~ Tue Nov 17 06:01
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reboot ~ Wed Nov 11 12:14
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reboot ~ Sat Oct 31 13:40
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reboot ~ Wed Oct 28 15:56
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reboot ~ Wed Oct 28 11:35
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reboot ~ Tue Oct 27 00:00
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reboot ~ Sun Oct 18 17:28
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reboot ~ Sun Oct 18 17:11
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reboot ~ Mon Oct 5 09:35
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reboot ~ Sat Oct 3 18:57
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wtmp begins Sat Oct 3 18:57
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```
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查看关机日期和时间，输入：
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`$ last shutdown`
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示例输出：
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```
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shutdown ~ Fri Dec 18 23:57
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shutdown ~ Mon Dec 14 09:53
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shutdown ~ Wed Dec 9 23:20
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shutdown ~ Tue Nov 17 14:24
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shutdown ~ Mon Nov 16 21:15
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shutdown ~ Tue Nov 10 13:15
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shutdown ~ Sat Oct 31 13:40
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shutdown ~ Wed Oct 28 03:10
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shutdown ~ Sun Oct 18 17:27
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shutdown ~ Mon Oct 5 09:23
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wtmp begins Sat Oct 3 18:57
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```
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### 如何查看是谁重启和关闭机器？
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你需要[启动 psacct 服务然后运行下面的命令][4]来查看执行过的命令，同时包括用户名，在终端输入 [lastcomm][5] 命令查看信息
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```
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# lastcomm userNameHere
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# lastcomm commandNameHere
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# lastcomm | more
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# lastcomm reboot
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# lastcomm shutdown
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### OR see both reboot and shutdown time
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# lastcomm | egrep 'reboot|shutdown'
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```
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示例输出：
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```
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reboot S X root pts/0 0.00 secs Sun Dec 27 23:49
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shutdown S root pts/1 0.00 secs Sun Dec 27 23:45
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```
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我们可以看到 root 用户在当地时间 12 月 27 日星期二 23:49 在 pts/0 重新启动了机器。
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### 参见
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* 更多信息可以查看 man 手册( man last )和参考文章 [如何在 Linux 服务器上使用 tuptime 命令查看历史和统计的正常的运行时间][6].
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### 关于作者
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作者是 nixCraft 的创立者同时也是一名经验丰富的系统管理员，也是 Linux，类 Unix 操作系统 shell 脚本的培训师。他曾与全球各行各业的客户工作过，包括 IT，教育，国防和空间研究以及非营利部门等等。你可以在 [Twitter][7] ,[Facebook][8]，[Google+][9] 关注他。
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||||
--------------------------------------------------------------------------------
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||||
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||||
via: https://www.cyberciti.biz/tips/linux-last-reboot-time-and-date-find-out.html
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||||
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||||
作者：[Vivek Gite][a]
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||||
译者：[amwps290](https://github.com/amwps290)
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||||
校对：[校对者ID](https://github.com/校对者ID)
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||||
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||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
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||||
[a]:https://www.cyberciti.biz/
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||||
[1]:https://www.cyberciti.biz/faq/unix-linux-who-command-examples-syntax-usage/ "See Linux/Unix who command examples for more info"
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[2]:https://www.cyberciti.biz/tips/wp-content/uploads/2006/04/last-reboot.jpg
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[3]:https://www.cyberciti.biz/media/new/tips/2006/04/check-last-time-system-was-rebooted.jpg
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[4]:https://www.cyberciti.biz/tips/howto-log-user-activity-using-process-accounting.html
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[5]:https://www.cyberciti.biz/faq/linux-unix-lastcomm-command-examples-usage-syntax/ "See Linux/Unix lastcomm command examples for more info"
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[6]:https://www.cyberciti.biz/hardware/howto-see-historical-statistical-uptime-on-linux-server/
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[7]:https://twitter.com/nixcraft
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[8]:https://facebook.com/nixcraft
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||||
[9]:https://plus.google.com/+CybercitiBiz
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Block a user