Linux常用命令

type 区别指定的命令是内部或外部命令

[root@centos8 ~]# type -a ls
ls is aliased to `ls --color=auto'
ls is /usr/bin/l

help 内部命令列表

[root@centos8 ~]# help echo 
echo: echo [-neE] [arg ...]
    Write arguments to the standard output.

enable 管理内部命令
enable cmd 启用内部命令
enable –n cmd 禁用内部命令
enable –n 查看所有禁用的内部命令

[root@centos8 ~]# enable /*查看所有的内部命令
[root@centos8 ~]# enable -n echo /*禁用内部命令
[root@centos8 ~]# enable -n	/*查看所有禁用的内部命令
enable -n echo
[root@centos8 ~]# enable echo	/*启用内部命令

lscpu命令可以查看cpu信息
cat /proc/cpuinfo也可看查看到

[root@centos8 ~]# lscpu 
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              2
On-line CPU(s) list: 0,1
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           2
NUMA node(s):        1
Vendor ID:           AuthenticAMD
BIOS Vendor ID:      AuthenticAMD
CPU family:          23
Model:               24
Model name:          AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
BIOS Model name:     AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx 

free查看内存

[root@centos8 ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:          1.7Gi       632Mi       517Mi        10Mi       640Mi       996Mi
Swap:         2.0Gi          0B       2.0Gi

lsblk查看分区情况

[root@centos8 ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  200G  0 disk 
├─sda1   8:1    0    1G  0 part /boot
├─sda2   8:2    0  100G  0 part /
├─sda3   8:3    0    2G  0 part [SWAP]
├─sda4   8:4    0    1K  0 part 
└─sda5   8:5    0   50G  0 part /data
sr0     11:0    1 1024M  0 rom 

echo输出字符串或者提取shell变量的值

[root@centos8 ~]# echo "holle word"
holle word
[root@centos8 ~]# echo  $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

screen命令多重视窗管理程序

[root@centos8 ~]# screen -ls
No Sockets found in /run/screen/S-root.

date命令显示日期与时间

[root@centos8 ~]# date
Thu Mar 31 20:47:30 CST 2022

ifconfig命令显示或设置网络设备

[root@centos8 ~]# ifconfig 
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.101  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::20c:29ff:fe30:437c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:30:43:7c  txqueuelen 1000  (Ethernet)
        RX packets 2522  bytes 839438 (819.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1933  bytes 170993 (166.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

export命令系统设置

[root@centos8 ~]# export -p
declare -x DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/0/bus"
declare -x HISTCONTROL="ignoredups"
declare -x HISTSIZE="1000"
declare -x HISTTIMEFORMAT="%H:%M"
declare -x HOME="/root"
declare -x HOSTNAME="centos8.org"
declare -x LANG="en_US.UTF-8"
declare -x LESSOPEN="||/usr/bin/lesspipe.sh %s"
declare -x LOGNAME="root"