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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

Setting Path in Linux

Setting a path information in windows is always been easier, since there is a GUI facility “Environmental Variables”, but I Linux setting a path is always been tricky and it should be done through CLI (Command Line Interface).  Here are the following ways to do:

Method 1:

For each user (Your login id) of Linux has a home folder (/home/username), there will be a file called as .bashrc (Ubuntu and Fedora) or .bash_profile (Fedora), whatever path has to be set, it should be entered in the above file.

For example: if the software is installed in /home/username/software1/, then the PATH has to be set in the .bashrc or .bash_profile file like this

export PATH=$PATH:/home/username/software1/

($PATH is a shell variable refers to the previous set path also to be included in the PATH setting.)

For Java Home

export JAVA_HOME=/home/username/<Java_path>

Method 2:

The above method of path is applicable only for that user. if other users wanted to access the software, then they have to set the paths. Because, for each user of Linux, the .bashrc or .bash_profile file exists.

if the same path is set for all the users, then the super user can set the path information in the following file

/etc/profile.d/your_path_name.sh

Open the file name (of your choice, but the extension is .sh) and has to be stored in /etc/profile.d/

This folder will be read during the booting process, so all the users of that machine will be able to access the software. The following line is copied to the shell file

export PATH=$PATH:/home/username/software1/

export JAVA_HOME=/home/username/<Java_path>

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