Server Uptime Command To Find Out How Long The System Has Been Running
UNIX / Linux uptime command
Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following commands:
[root@sujeet ~]# uptime
11:10:46 up 1:15, 7 users, load average: 0.30, 0.20, 0.11
The uptime command gives a one line display of the following information.
- The current time (11:10:46)
- How long the system has been running (up 1:15 hours)
- How many users are currently logged on (7 user)
- The system load averages for the past 1, 5, and 15 minutes (0.30, 0.20, 0.11)
This is the same information contained in the header line displayed by the w and top commands:
[root@sujeet ~]# w
11:13:32 up 1:18, 7 users, load average: 0.52, 0.35, 0.18
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root :0 - 15:12 ?xdm? 6:16 0.09s /usr/bin/gnome-
root pts/1 :0.0 15:13 ? 0.03s 0.03s bash
root pts/2 :3.0 15:15 ? 0.04s 0.03s bash
root pts/3 :3.0 15:15 ? 1.42s 0.14s bash
root pts/4 :3.0 15:51 ? 3:38 14.89s scp -r /u02/PRO
root pts/5 :3.0 11:51 11:06 0.02s 0.02s bash
root pts/6 192.168.1.3 11:10 0.00s 0.04s 0.02s w
[root@sujeet ~]# top
top - 11:14:21 up 1:19, 7 users, load average: 0.47, 0.37, 0.19
Tasks: 424 total, 1 running, 423 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2%us, 0.2%sy, 0.0%ni, 99.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 47490168k total, 13322048k used, 34168120k free, 288916k buffers
Swap: 16777208k total, 0k used, 16777208k free, 10071952k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14309 root 20 0 13020 1352 808 R 0.7 0.0 0:00.06 top
4293 root 20 0 270m 15m 12m S 0.3 0.0 0:21.58 vmtoolsd
4340 root 20 0 70376 2656 2048 S 0.3 0.0 0:00.72 escd
4392 root 20 0 13064 1240 972 S 0.3 0.0 0:00.31 gam_server
4842 root 20 0 271m 15m 12m S 0.3 0.0 0:13.48 vmtoolsd
5057 root 20 0 283m 20m 9032 S 0.3 0.0 0:23.81 gnome-terminal
10885 applchin 20 0 669m 43m 7664 S 0.3 0.1 0:08.17 java
Server last Reboot time
who command
You need to use who command, to print who is logged on. It also displays the time of last system boot. Use last command to display system reboot and shutdown date and time.
[root@sujeet ~]# who -b
system boot 2015-03-31 09:54
Use last command to display listing of last logged in users and system last reboot time and date:
[root@sujeet ~]# last reboot | less
reboot system boot 2.6.32-300.10.1. Tue Mar 31 09:54 (01:21)
reboot system boot 2.6.32-300.10.1. Sun Mar 29 02:15 (2+09:00)
reboot system boot 2.6.32-300.10.1. Wed Mar 25 14:54 (3+11:19)
reboot system boot 2.6.32-300.10.1. Wed Jan 28 11:19 (56+03:33)
[root@sujeet ~]# last reboot | head -1
reboot system boot 2.6.32-300.10.1. Tue Mar 31 09:54 (01:24)
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.
[root@sujeet ~]# last -x|grep shutdown | head -1
shutdown system down 2.6.32-300.10.1. Sun Mar 29 02:14 - 11:19 (2+09:05)
-x: Display the system shutdown entries and run level changes.
[root@sujeet ~]# cat /var/log/messages
Try the following commands:
Display list of last reboot entries:
last reboot | less
Display list of last shutdown entries:
last -x | less
or more precisely:
last -x | grep shutdown | less
Some possible log files to explore: (found a Ubuntu system, but I would hope that they're present on most Linux/Unix systems)
/var/log/debug
/var/log/syslog (will be pretty full and may be harder to browse)
/var/log/user.log
/var/log/kern.log
/var/log/boot
