linux的常用的五个命令介绍（Linux工作常用命令二）
linux的常用的五个命令介绍（Linux工作常用命令二）那么我们需要分析，我们系统具体负载多少？11:16:46 up 1:31 2 users load average: 0.00 0.01 0.05我们 电脑 或服务器 ，都 会存在可能死机 ，或者是系统反应特别慢 ，这种情况下，有时候需要查系统负载 。我们确定了有两个 用户访问系统，产生负载[root@localhost tmp]# uptime
Linux 工作常用命令（一）解释！（图文并茂）
uptime
查看服务器负载
uptime
我们 电脑 或服务器 ，都 会存在可能死机 ，或者是系统反应特别慢 ，这种情况下，有时候需要查系统负载 。
我们确定了有两个 用户访问系统，产生负载
[root@localhost tmp]# uptime
11:16:46 up 1:31 2 users load average: 0.00 0.01 0.05
那么我们需要分析，我们系统具体负载多少？
0.00：代表系统1分钟以内产生的负载
0.01：代表5分钟产生的负载
0.05：代表10分钟或者15分钟产生的负载
who
显示当前用户
[root@localhost tmp]# who
root tty1 2020-07-20 09:46
root pts/0 2020-07-20 10:39 (192.168.92.1)
[root@localhost tmp]#
yum
以yum的方式安装rpm包自动解决依赖
yum install httpd
你就记住，这个是安装的软件包 或者程序
[root@localhost tmp]# yum list httpd
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Installed Packages
httpd.x86_64 2.4.6-40.el7.centos @local_repo
[root@localhost tmp]#
Yum install httpd –y
rpm
手动安装rpm软件包 自行解决依赖
Rpm -ivh *.rpm
[root@localhost Packages]# ls | grep net-tools
net-tools-2.0-0.17.20131004git.el7.x86_64.rpm
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]# rpm -ivh net-tools-2.0-0.17.20131004git.el7.x86_64.rpm ^C
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]# ifconfig
-bash: ifconfig: command not found
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]# route
-bash: route: command not found
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]# rpm -ivh net-tools-2.0-0.17.20131004git.el7.x86_64.rpm
Preparing... ################################# [100%]
Updating / installing...
1:net-tools-2.0-0.17.20131004git.el################################# [100%]
[root@localhost Packages]#
[root@localhost Packages]# ifconfig
eno16777736: flags=4163<UP BROADCAST RUNNING MULTICAST> mtu 1500
inet 192.168.92.128 netmask 255.255.255.0 broadcast 192.168.92.255
inet6 fe80::20c:29ff:fefe:832f prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:fe:83:2f txqueuelen 1000 (Ethernet)
RX packets 6028 bytes 560538 (547.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2520 bytes 1371353 (1.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP LOOPBACK RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost Packages]#
其实find命令使用频率特别高，一般查找文件
Find 目录 -name 文件名
[root@localhost ~]# cd /
[root@localhost /]# find /tmp -name test2.txt
/tmp/home/test2.txt
[root@localhost /]# find /tmp -name *.txt
/tmp/home/test2.txt
这种情况有时候，你就是记不住文件名，但你能知道文件一些内容的情况，特别用！
[root@localhost ~]# find /tmp/home/ -type f | xargs grep -n hello
/tmp/home/test2.txt:1:hello world
Binary file /tmp/home/test2.zip matches
[root@localhost /]# cat /etc/passwd | grep root
root:x:0:0:root:/root:/bin/bash
operator:x:11:0:operator:/root:/sbin/nologin
[root@localhost /]#
pwd这个命令，它的使用场景，比如你进入目录特别长，你记不住了，那么需要查看一下当前你正在工作的目录
[root@localhost /]#
[root@localhost /]# cd /tmp/home/
[root@localhost home]# pwd
/tmp/home
[root@localhost home]#
cat tail head more
查看文件内容
cat /etc/passwd |awk -F ':' '{print $1}'
cat /proc/cpuinfo
cat /proc/mounts 系统挂载信息
cat /proc/loadavg 系统负载信息
cat /proc/meminfo 系统内存信息
tail -10 file1 | head -3
查看文件内容命令，特别重要
查看头10行：
[root@localhost log]# head -n 10 boot.log
[ OK ] Started Show Plymouth Boot Screen.
[ OK ] Reached target Paths.
[ OK ] Reached target Basic System.
GG[ OK ] Found device VMware_Virtual_S 3.
Starting File System Check on /dev/disk/by-uuid/17608c95-bf26-4e27-9c9d-8e9db929916b...
[ OK ] Started dracut initqueue hook.
[ OK ] Reached target Remote File Systems (Pre).
[ OK ] Reached target Remote File Systems.
[ OK ] Started File System Check on /dev/disk/by-uuid/17608c95-bf26-4e27-9c9d-8e9db929916b.
Mounting /sysroot...
[root@localhost log]#
如果你想最后10行内容：
[root@localhost log]# tail -n 10 boot.log
[ OK ] Started irqbalance daemon.
Starting irqbalance daemon...
[ OK ] Started D-Bus System Message Bus.
Starting D-Bus System Message Bus...
Starting Dump dmesg to /var/log/dmesg...
Starting firewalld - dynamic firewall daemon...
[ OK ] Started System Logging Service.
[ OK ] Started Permit User Sessions.
[ OK ] Reached target Sound Card.
Starting Terminate Plymouth Boot Screen...
[root@localhost log]#
如果你想翻页显示，你们就是用MORE
[root@localhost log]# more boot.log
[ OK ] Started Show Plymouth Boot Screen.
[ OK ] Reached target Paths.
[ OK ] Reached target Basic System.
GG[ OK ] Found device VMware_Virtual_S 3.
Starting File System Check on /dev/disk/by-uuid/17608c95-bf26-4e27-9c9d-8e9db929916b...
[ OK ] Started dracut initqueue hook.
[ OK ] Reached target Remote File Systems (Pre).
[ OK ] Reached target Remote File Systems.
[ OK ] Started File System Check on /dev/disk/by-uuid/17608c95-bf26-4e27-9c9d-8e9db929916b.
Mounting /sysroot...
[ OK ] Mounted /sysroot.
[ OK ] Reached target Initrd Root File System.
Starting Reload Configuration from the Real Root...
[ OK ] Started Reload Configuration from the Real Root.
[ OK ] Reached target Initrd File Systems.
last
显示系统最近登录的账户
last -n 10
[root@localhost log]# last -n 10
root pts/0 192.168.92.1 Wed Jul 22 10:05 still logged in
root tty1 Wed Jul 22 09:56 still logged in
reboot system boot 3.10.0-327.el7.x Wed Jul 22 09:56 - 11:04 (01:08)
root pts/0 192.168.92.1 Wed Jul 22 09:36 - crash (00:20)
root tty1 Wed Jul 22 08:34 - 09:55 (01:20)
reboot system boot 3.10.0-327.el7.x Wed Jul 22 08:34 - 11:04 (02:30)
root pts/0 192.168.92.1 Wed Jul 15 15:10 - 17:17 (02:06)
root tty1 Wed Jul 15 15:09 - 17:17 (02:08)
reboot system boot 3.10.0-327.el7.x Wed Jul 15 15:09 - 17:17 (02:08)
root pts/0 192.168.92.1 Wed Jul 15 13:58 - crash (01:11)
wtmp begins Mon Jul 13 09:57:12 2020
hostname
显示主机名
Hostname -a
[root@localhost log]# hostname
localhost.localdomain
[root@localhost log]# hostname client
[root@localhost log]#
[root@localhost log]#
[root@localhost log]# hostname
client
[root@localhost log]#
