1.uptime命令
输出:16:11:40 up 59 days, 4:21, 2 users, load average: 0.00, 0.01, 0.00
2.查看/proc/uptime文件计算系统启动时间
cat /proc/uptime
输出: 5113396.94 575949.85
第一数字即是系统已运行的时间5113396.94 秒,运用系统工具date即可算出系统启动时间
代码:
[root@localhost ~]# date -d "$(awk -F. '{print $1}' /proc/uptime) second ago"
+"%Y-%m-%d %H:%M:%S"
2018-7-27 14:32:35
3.查看/proc/uptime文件计算系统运行时间
代码:
[root@localhost ~]# cat /proc/uptime| awk -F. '{run_days=$1 /
86400;run_hour=($1 % 86400)/3600;run_minute=($1 % 3600)/60;run_second=$1 %
60;printf("系统已运行:%d天%d时%d分%d秒",run_days,run_hour,run_minute,run_second)}'
系统已运行:0天0时24分34秒
1: who 命令查看
who -b 查看最后一次系统启动的时间。
[root@localhost ~]# who -b
system boot 2018-7-27 14:32
who -r 查看当前系统运行时间
[root@localhost ~]# who -r
run-level 3 2018-7-27 14:33
2: last reboot
如下所示last reboot可以看到Linux系统历史启动的时间。 重启一下操作系统后,然后
[root@DB-Server ~]# last reboot
reboot system boot 3.10.0-327.el7.x Fri Oct 27 14:32 – 14:59 (00:26)
wtmp begins Fri Oct 27 14:32:39 2017
#如果只需要查看最后一次Linux系统启动的时间
[root@DB-Server ~]# last reboot | head -1
reboot
system boot 2.6.9-42.ELsmp Thu May 29 15:25 (00:08)
3:TOP命令查看
如下截图所示,up后表示系统到目前运行了多久时间。反过来推算系统重启时间
[root@localhost ~]# who -b
system boot 2018-7-27 14:32
top – 15:00:29 up 27 min, 2 users, load average: 0.00, 0.01, 0.05
Tasks: 99 total, 1 running, 98 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.2 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 8176008 total, 7892856 free, 131764 used, 151388 buff/cache
KiB Swap: 8257532 total, 8257532 free, 0 used. 7868548 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1855 root 20 0 0 0 0 S 0.3 0.0 0:00.33 kworker/0:2
1 root 20 0 44496 7168 2612 S 0.0 0.1 0:02.32 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.05 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
6 root 20 0 0 0 0 S 0.0 0.0 0:00.03 kworker/u4:0
7 root rt 0 0 0 0 S 0.0 0.0 0:00.06 migration/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/1
11 root 20 0 0 0 0 S 0.0 0.0 0:00.33 rcu_sched
12 root 20 0 0 0 0 S 0.0 0.0 0:00.12 rcuos/0
13 root 20 0 0 0 0 S 0.0 0.0 0:00.37 rcuos/1
14 root rt 0 0 0 0 S 0.0 0.0 0:00.01 watchdog/0
15 root rt 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/1
16 root rt 0 0 0 0 S 0.0 0.0 0:00.08 migration/1
17 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1
19 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/1:0H
4: w命令查看
如下截图所示,up后表示系统到目前运行了多久时间。反过来推算系统重启时间
[root@localhost ~]# w
15:00:56 up 28 min, 2 users, load average: 0.00, 0.01, 0.05
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root tty1 14:33 25:52 0.07s 0.07s -bash
root pts/0 10.0.100.55 14:37 0.00s 0.10s 0.00s w
5:uptime 命令查看
[root@localhost ~]# uptime
15:01:40 up 29 min, 2 users, load average: 0.00, 0.01, 0.05
6: 查看/proc/uptime
方法一:
[root@localhost ~]# cat /proc/uptime
1778.05 3520.28
方法二:
[root@localhost ~]# date -d "`cut -f1 -d. /proc/uptime` seconds ago"
Fri Oct 27 14:32:35 CST 2017
方法三:
[root@localhost ~]# date -d "$(awk -F. '{print $1}' /proc/uptime) second ago"
+"%Y-%m-%d %H:%M:%S"
2018-7-27 14:32:35