1. 查询时间：date命令
[root@Server-n93yom ~]# date Thu Jul 25 23:47:24 CST 2019
2.查询日历：cal命令 cal -y 显示一年的日历
[root@Server-n93yom ~]# cal July 2019 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
3.查询磁盘剩余空间：df -h (df为disk free)
[root@Server-n93yom ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/cl-root 47G 19G 29G 40% / //家目录 总使用19G可用29G devtmpfs 7.8G 0 7.8G 0% /dev tmpfs 7.8G 16K 7.8G 1% /dev/shm tmpfs 7.8G 17M 7.8G 1% /run tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup /dev/sda1 1014M 139M 876M 14% /boot tmpfs 1.6G 0 1.6G 0% /run/user/0
4.查询文件目录的大小：du -h [目录名] （du为disk usage）
-h 人性化的显示文件的大小
[root@Server-n93yom ~]# ll total 8 -rw-------. 1 root root 1706 Jun 17 09:56 anaconda-ks.cfg -rw-r--r-- 1 root root 1 Jul 25 23:05 cal.txt drwxr-xr-x 2 root guanbin 19 Jul 22 16:09 test drwxr-xr-x. 2 root root 54 Jul 23 14:02 tmp [root@Server-n93yom ~]# du -h tmp 34M tmp [root@Server-n93yom ~]#
5. ps aux 查看当前进程的详细状况
a:显示终端上的所有进程，包括其他用户的进程
u:显示进程的详细状态
x:显示没有控制终端的进程
[root@Server-n93yom ~]# ps PID TTY TIME CMD 799 pts/0 00:00:00 bash 1490 pts/0 00:00:00 top 4947 pts/0 00:00:01 du 5036 pts/0 00:00:00 ps [root@Server-n93yom ~]#
[root@Server-n93yom ~]# ps a PID TTY STAT TIME COMMAND 706 tty1 Ss+ 0:00 /sbin/agetty --noclear tty1 linux 799 pts/0 Ss 0:00 -bash 1490 pts/0 T 0:00 top 4947 pts/0 T 0:01 du -h 5139 pts/0 R+ 0:00 ps a [root@Server-n93yom ~]#
[root@Server-n93yom ~]# ps au USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 706 0.0 0.0 110036 840 tty1 Ss+ Jul19 0:00 /sbin/agetty --noclear tty1 linux root 799 0.0 0.0 115484 2172 pts/0 Ss 22:41 0:00 -bash root 1490 0.0 0.0 157720 2284 pts/0 T 22:53 0:00 top root 4947 0.6 0.0 108552 1504 pts/0 T 23:50 0:01 du -h root 5144 0.0 0.0 151060 1828 pts/0 R+ 23:54 0:00 ps au
6. top 动态显示运行中的进程并且排序 q退出该命令
[root@Server-n93yom ~]# top top - 23:55:38 up 6 days, 8:04, 1 user, load average: 0.05, 0.09, 0.07 Tasks: 155 total, 2 running, 151 sleeping, 2 stopped, 0 zombie %Cpu(s): 0.7 us, 0.3 sy, 0.0 ni, 98.8 id, 0.1 wa, 0.0 hi, 0.1 si, 0.0 st KiB Mem : 16264548 total, 4064528 free, 8669832 used, 3530188 buff/cache KiB Swap: 2097148 total, 2097148 free, 0 used. 7169176 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 730 mysql 20 0 8505256 1.423g 17008 S 0.7 9.2 52:11.58 mysqld 1200 consul 20 0 209392 51200 31248 S 0.7 0.3 26:40.10 consul 2770 rabbitmq 20 0 3378860 111520 4652 S 0.7 0.7 69:23.84 beam.smp 4147 cfyuser 20 0 4749292 0.986g 19516 S 0.7 6.4 42:45.91 java 17414 tomcat 20 0 12.240g 2.808g 13896 S 0.7 18.1 29:14.69 java 1185 prometh+ 20 0 166468 51148 18532 S 0.3 0.3 12:59.10 prometheus 1188 cfyuser 20 0 852492 73116 7200 S 0.3 0.4 12:52.08 celery 1229 cfyuser 20 0 16072 4884 3416 S 0.3 0.0 9:48.48 serf 5193 root 20 0 157720 2284 1560 R 0.3 0.0 0:00.03 top 1 root 20 0 43352 3716 2384 S 0.0 0.0 0:16.50 syste
7. kill [-9] 进程号 ： 终止指定代号的进程，-9表示强行终止