Day-'13&'14 - Networking Commands

Network Configuration Command:

Ifconfig - (Interface Configuration)

used to display/configure the IP interfaces, Used to see IP address, mac address of system.

* ifconfig is replaced with ip addr command

hostname - To display the hostname of the system

The host name is set and maintained in etc/hostname

hostnamectl - used to change the hostname of the present system we use hostnamectl ommand

for modern linux distributions we use this command

→ hostnamectl set-hostname ‘the new name’

ping - Used to check the network connectivity between 2 systems/machines

It uses internet control protocol

ping<ipaddress/domain jps>

traceroute ipaddress

port no’s : sshd 22(default port)

tomcat 2020

jenkins 8080

nexus 8081

telnet - telnet <ipaddress><port>

curl -v telnet://ipaddress:port(ssh)

netstat -tunlp

checking, what process are listening, which port is running

ss -tunlp

To know which process is accepting which port.

nslookup/dig - For checking the ip address of any domain

eg: nslookup www.google.com

wget - used to download files, softwares from http

we can also use curl command for downloading

wget’url’

url→ what we want to download

wget -o name.zip ‘url’ - To change the name and download

awk -

It is a scripting language itself.

If we give patterns, it search for the pattern and give output wherever that pattern is present

syntax:

awk ‘pattern {action}’filename.txt

→ awk ‘{print}’ awk.txt

It prints all the content of the awk file

→ awk ‘{print $2}’ awk.txt

It displays 2nd column of the file

→awk ‘{print $2,$3}’ awk.txt

It displays 2nd and 3rd columns of the file

→ awk ‘{print NR}’ awk.txt

It displays the line no to the file

→ awk ‘\sandhya\{print}’ awk.txt

It displays the text sandhya where ever is there

→ awk ‘\sweety/{print $2}’ awk.file

It displays the text where ever sweety is there in the 2nd column

→awk ‘\sweety/{print NR,$2}’ awk.file

It displays the text where ever sweety is there in the 2nd column, and gives the line no

awk ‘NR==2,NR==3{print NR,$0}’ awk.file

It displays 2 and 3 rows of the text

awk ‘‘$3>24{print NR,$0}’ awk.file

It executes with a condition in column 3 it displays the lines where the text is greater than 24

→ awk ‘{print}’ awk.txt | sort

It sorts and displays the text

cp→ cp is used to copy the file/directory within the same server

scp- (secure copy)

It is used to copy the files/directories securely between 2 servers

syntax:

scp <sourcefile/directory>username@ipaddress:/destination>

crontab - used to schedule the jobs to run automatically at a specified time/date

* * * * *

min, hours, day, month, day of week

30 2 * * * → 2:30