Linux命令02--系统管理
<1>查看当前日历：cal
<2>显示或者设置时间
设置时间格式（需要管理员权限）；一般都是有ntp服务的，你的系统会根据这个对照互联网时间
<3>查看进程信息：ps
所有和系统相关的 aux
[root@localhost ~]# ps -aux
<4>杀死进程kill
<5>关机重启：reboot、shutdown、init
windows是单用户，linux是多用户可以多人操作使用。
<6>检测磁盘空间：df
[root@localhost ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/centos-root 17811456 1770616 16040840 10% / devtmpfs 486744 0 486744 0% /dev tmpfs 498976 0 498976 0% /dev/shm tmpfs 498976 7856 491120 2% /run tmpfs 498976 0 498976 0% /sys/fs/cgroup /dev/sda1 1038336 132616 905720 13% /boot tmpfs 99796 0 99796 0% /run/user/0 [root@localhost ~]# df -lh Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 17G 1.7G 16G 10% / devtmpfs 476M 0 476M 0% /dev tmpfs 488M 0 488M 0% /dev/shm tmpfs 488M 7.7M 480M 2% /run tmpfs 488M 0 488M 0% /sys/fs/cgroup /dev/sda1 1014M 130M 885M 13% /boot tmpfs 98M 0 98M 0% /run/user/0
<7>检测目录所占磁盘空间：du
[root@localhost ~]# du 0 ./test 56 . [root@localhost ~]# cd /bin/ [root@localhost bin]# du 105680 . [root@localhost bin]# du -lh 110M . [root@localhost bin]# [root@localhost bin]# du -alh 152K ./cp 144K ./cpio 0 ./captoinfo 52K ./csplit 8.0K ./clear 44K ./cut ... ... 48K ./filterdiff 4.0K ./fixcvsdiff 0 ./flipdiff 0 ./grepdiff 52K ./interdiff 0 ./lsdiff 110M . [root@localhost bin]# cd - /root [root@localhost ~]# du -alh 4.0K ./.bash_logout 4.0K ./.bash_profile 4.0K ./.bashrc 4.0K ./.cshrc 4.0K ./.tcshrc 4.0K ./anaconda-ks.cfg 4.0K ./.bash_history 12K ./.123.py.swp 4.0K ./ls.txt 4.0K ./kris-1.tar.gz 4.0K ./kris-2.tar.bz2 4.0K ./mmmm.zip 0 ./test/123_2.py 0 ./test/345link_2.py 0 ./test/345link.py 0 ./test 56K . [root@localhost ~]#
<8>top显示运行中的进程
[root@localhost ~]# top top - 17:49:54 up 2:03, 2 users, load average: 0.00, 0.01, 0.05 Tasks: 99 total, 1 running, 98 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.3 us, 0.0 sy, 0.0 ni, 99.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 997956 total, 709144 free, 135940 used, 152872 buff/cache KiB Swap: 2097148 total, 2097148 free, 0 used. 692464 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 128236 6868 4080 S 0.0 0.7 0:02.73 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 0:00.16 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 0:00.17 kworker/u256:0 7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 [root@localhost ~]# q 按q结束
<9>查看或配置网卡信息：ifconfig
<10>测试远程主机连通性：ping
