How to check whether port is open or not in Linux

Syntax:

echo > /dev/tcp/[host]/[port] && echo "Port is open"
echo > /dev/udp/[host]/[port] && echo "Port is open"

Example:

echo > /dev/tcp/172.16.11.45/7091 && echo "Port is open"

 echo > /dev/tcp/172.16.11.45/7091 && echo "Port is open"

sendEmail[18533]: ERROR => No TLS support! SendEmail can't load required libraries. (try installing Net::SSLeay and IO::Socket::SSL)

Getting the below error while trying to send mail using sendEmail on Linux:

sendEmail[18533]: ERROR => No TLS support!  SendEmail can't load required libraries. (try installing Net::SSLeay and IO::Socket::SSL)

Resolution:

To resolve this install the below rpms

yum install 'perl(Net::SSLeay)

yum install 'perl(IO::Socket::SSL)'

Now try to send the mail again

It is failed with below error:

at ./sendEmail line 1906.

invalid SSL_version specified at /usr/share/perl5/vendor_perl/IO/Socket/SSL.pm line 444.

To resolve this error modify sendEmail file as below

Now try to send the mail again, we will get a successful message

Creating user and making it as a owner to a specified directory in linux

Creating groups:

Creating user and assigning groups to it:

Creating a directory:

Making user as the owner of the newly created directory:

Login with user and check

Step by Step installing Apache Subversion

Prerequisite:

Httpd:

Installing Subversion:

Configuring Subversion with HTTP:

Save and close the file.

Creating the SVN repository:

Creating users for authentication:

Restart the httpd server:

Accessing Repository in the browser:

Finding files that use the most disk space in linux

Command to list the top 10 largest directories from the current path

du -sh * | sort -hr | head -n10

Command to unzip all the zip files in a directory in Linux

Below is a directory containing 5 zip files

To extract all the zip files at a time run the below command

#unzip \*.zip

Installing vnc server on centos 7

Installing Gnome Desktop

Connect to the server as root user in putty

Use yum to install Gnome Desktop package

Enter "y" to install all the dependencies and package

Wait until the package got installed, it  will take some time

Installing Tiger vnc server

Install vnc server as below using yum

Start the vnc server

Here  vnc session started with session id "1"

Connecting to the server using vnc viewer

Open the vnc viewer and provide server ip and session id

Click on ok

Provide the password and click on ok

How to skip prerequisite check while installing oracle softwares on linux operating system

Installing obiee software on linux throwing prerequisite check failed error

To install the software by ignoring the prerequisite check , issue the command as below

Running 32 bit software on Linux 64 bit operating system

Try to Run the 32 bit software on 64 bit operating systemWe will get below waring and resolution for it

Setting 32 bit emulation mode



Running the 32 bit software again

Changing your Python version with Anaconda ( Installing Anaconda Python )

Checking the current python version

Installing Anaconda Python:

Searching for available python modules in anaconda

Installing python using conda

Type y to continue installation

Installation completed .

Now check for the updated python version