The common commands/concepts used by mark in learning and using CentOS

Network configuration

After installing the minimal version system, the CentOS system's NIC is not enabled by default, and we can edit the network configuration with the following command:

Vi/etc/sysconfig/network-scripts/ifcfg-eth0

If you use DHCP, you need to set the following format:

Device=eth0
Hwaddr=08:00:27:0f:5c:17
Type=ethernet
uuid=64ea57af-9329-40c4-90da-bf239cecea4f
Onboot=yes
Nm_controlled=yes
Bootproto=dhcp

If you are a fixed IP, you need to set the following format:

Device=eth0
Hwaddr=08:00:27:0f:5c:17
Type=ethernet
uuid=64ea57af-9329-40c4-90da-bf239cecea4f
Onboot=yes
Nm_controlled=yes
Bootproto=static
ipaddr=192.168.0.2
netmask=255.255.255.0
gateway=192.168.0.1
dns1=61.128.128.68
dns2=61.128.128.69
Ipv6init=no

When Setup is complete, you need to restart the network service by running the following command:

Service Network restart

Finally, you can use the following command to view the IP address:

Ifconfig

Reboot/Shutdown command

Reboot command:

Reboot
Shutdown-r now #立刻重启 (used by root)
Shutdown-r #过10分钟自动重启 (used by root)
Shutdown-r 23:59 #在时间为23: Reboot at 59 (root user)
#如果是通过shutdown命令设置重启的话, you can cancel the reboot with the SHUTDOWN-C command

Shutdown command:

Halt #立刻关机
Poweroff #立刻关机
Shutdown-h now #立刻关机 (used by root)
Shutdown-h #10分钟后自动关机
#如果是通过shutdown命令设置关机的话, you can cancel the reboot with the SHUTDOWN-C command
Cleanup command

sudo yum AutoClean
sudo yum clean
sudo yum autoremove
These three commands primarily clean up the upgrade cache and the unwanted packets.

ls command

ls [options] [Files/directories]
-a displays all files, including hidden information
-L Display Details
-D View Directory properties
-H humanized Display file size
-I display Inode

Extended:

# LS-LH File Permissions Interpretation
-rw-r--r--. 1 root 7.5K November 9 15:45 Install.log
#-File type
# rw-Owner Permissions
# r--Owning group permissions
# r--Other People's permissions
# . Delegate ACL permissions
# 1 Reference count
# root Owner
# Root All Groups
# r Read/w Write/x execution

Directory processing commands

# Create a directory
mkdir [Options] [contents]
-P Recursive processing
# mkdir-p Blog/css

# Toggle Directory (tab to identify directory completion)
CD [Directory]
~ Enter User Home directory
-Go to last directory
.. Go to Superior Directory
. Enter current directory

# Displays the current directory
Pwd