1.13 Linux Notes

Free-m look at the memory
Script

RPM-IVH Display Process
Rpm-u--upgrade
Rpm-f--freshen
Rpm-e--erase
RPM-E Koren

Find/-name kernel-* look for all files after Hernel

Ifconfig eth0 192.168.0.1 netmask 255.255.255.0

Service Network restart

Ifup eth0
Ifdown eth0

Route-n
Route add default GW 192.168.0.250

Route add-net 10.0.0.0 netmask 255.0.0.0 dev eth0 gw 192.168.0.250
Route add-host 10.0.0.3 Dev eth0 gw 192.168.0.250
Route Del-host 10.0.0.3

grep root/etc/passwd

grep Root/etc/shadow

grep root/etc/group
Useradd-u 6000-g tom-g root-d/home/jack-s/sbin/nologin

Usermod-s/sbin/nologin Jack

Usermod-u 50000 Jack

Usermod-l Jack.
Usermod-u Jack.
Usermod-r Jack.

Cat connects and outputs a file

cp/etc/skel/.bask*/home/natasha1/No environment variables

/etc/default/useradd useradd Standard T-template
Template for/etc/login.defs UID

############# Create 100 user test1~100 password Redhat
Vim useradd.sh
For user in $ (SQL 1 100)
Do
Useradd Test&user
echo Redhat |passwd--stdin Test$user
Done

chmod u+x useradd.sh
./useradd.sh

####################################
OpenSSH
Rpm-qa |grep OpenSSH
SSH IP
SSH [email protected]
Ssh-l Account IP
Service sshd status to see if SSH is running

SCP Secure File Transfer
Scp/tmp/abc.txt 192.168.0.18:/root
SCP 192.168.0.18:/root/abc.txt/tmp
-R recursive-p permission

Rsync Incremental Backup tool
Usage equals SCP

Ssh-keygen
CD. ssh/
Id_rsa id_rsa.pub
Ssh-copy-id-i Id_rsa Pub 192.168.0.18

################
FTP Lftp gftp
FTP 192.168.0.8
Account FTP (anonymous account)
Password null
Account Instructor
Password 2345667
Bye goodbye

Lftp 192.168.0.8
Equivalent to FTP
Support Tab

Get
Mget
Mirror
##############
Smbclient
Smbclient-l 192.168.0.254

Smbclient//192.168.0.254/ftp-u Instructor

SMBPASSWD-A Instructor
Fill in the password yourself

###############
Ping
Traceroute
Host
Dig = nslookup
Nslookup
Netstat-r
Netstat-ntulp |grep:22

##########
Vnc
/etc/issue See version

Vncserver:1 J Creating a VNC Desktop 1

Vi/root/.vnc/xstartup
Unset #去掉
EXEC #去掉
Gnome-seesion &

Vi/etc/sysconfig/vncserver
vncservers= "1:root 2:root" #去掉 1 means that the root of the desktop is connected with root
vncserverages[Change to 100]
Service Vncserver Restart

Vncviewer
VNC port number is 5900+ desktop number
can use Netstat-ntulp |grep:590x to query

SSH 192.168.0.17-x
X0vncserver--passwordfile=/root/.vnc/passwd Remote shared desktop

1.13 Linux Notes