Marco Education class 20-2 first week study notes 4

Power on with root access system method

CENTOS6 Centos7 with the same command (all entered with the root account)

Gedit/etc/gdm/custom.conf
[Daemon]

Automaticloginenable=true//Automatic login Open
Automaticlogin=root//Auto-login account
[Security]

[XDMCP]
[Greeter]
[Chooser]
[Debug]



Modify Computer Name

Centos6
Temporary modification
hostname XXX//reboot will restore the original host name

Vi/etc/sysconfig/network
HOSTNAME=XXXXX//Permanently modify host name


Centos7
Hostnamectl set-hostname "CentOS"
Reboot
Vi/etc/hostname

Poweroff//Do not halt, because in Centos7, halt does not power off, so the system card in a position





Clear Screen Command

Clear = Ctrl + L

Getting Started with Linux
LS CD pwd cp tar who whoami Poweroff halt (Power off constantly) gedit Init 3 init 5 reboot=init 6 chvt 0-6 cat more ifconfig TTY fre E lscpu lsblk Logout clear File Exit Cat/proc/meminfo

Administrator Root

UID =user ID

The system uses the ID number to determine whether it is an administrator
Only 0 is the administrator.
View Current ID:
Id-u

[Email protected] ~]# id-u zcl1840
1000

[Email protected] ~]# id-u zcl1840
500

Console Console

Terminal Terminal

Interactive interface
Gui:
KDE GNOME XFCE

Cli
Shell
Interpreter for Linux commands
Includes: Bash CSH zsh ksh sh tcsh
The system user account is Nologin

Echo $SHELL
Cat/etc/shells See how many shells there are

Hierarchical structure

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Marco Education class 20-2 first week study notes 4