Skip to main content

Prerequisites for learning NS2

At many places, I happen to see researchers and students wanted to use Windows for NS2 rather than Linux. The reason may be,
  • Linux is tough
  • It occupies more space and more memory in my Computer
  • Linux uses lot of commands and i am not aware of it
  • Tough to handle dual boot OS (windows and Linux)
  • always wanted to be in the cakewalk. (never try a new thing)
  • etc
ns2
ns2 installation in Linux

But here are some basic tips for using NS2 under a Linux Machine.
  • It is enough to know some basic Linux commands to work with NS2 (hardly not more than 20 commands)
  • One should have a basic knowledge of how tree structure in Linux/Unix look like
  • Finally, where to set the PATH information in Linux
With all the above three, one can confidentially work on Linux. As for as windows is concerned, upto NS2.27 version is tested under windows and recent versions there is no hope (however it will work fine, but “Use at your Own Risk”)
Now we will see some basic Linux commands that are needed for NS2.
  1. ls => listing the file contents
  2. ls -l => listing the file in long format, it tells you about the ownership and permissions
  3. chmod => Changing the mode of the file (syntax is chmod 755 <filename>
  4. echo => it echo the value to the screen
    1. Example: echo name
    2. echo $SHELL (it will print the name of the shell)
    3. echo $USER (it will print the name of the user)
    4. echo $PATH (it display the values contained in the PATH variable)
    5. echo $HOME (it displays the home folder of the user) (Now you can understood that the variable names are denoted using a $ symbol)
  5. pwd => it is just present working directory
  6. make => (it executes the instructions given in the Makefile which is available under that directory)
  7. gcc filename.cxx => A command to run the gcc compiler (This is not necessarily needed for NS2, but as a developer, you should know)
  8. ./install  => (See a dot in the beginning, it is just executing the install file which is available under a folder, any executable can be executed with the help of this ./)
  9. passwd => changing the password of the current user
  10. cd => change the directory
  11. mkdir => make a directory
  12. gedit => it is similar like a notepad editor in windows(syntax is gedit filename)
  13. vi => it is vi editor
Path setting
The path can be set in a file which is available for each user of the Linux OS.  For example, a user called  “pradeep” will have the home folder as /home/pradeep and another user “kumar” has home folder as /home/kumar
Each user “pradeep” and “kumar” will have a file called .bash_profile (in case of redhat and fedora) and .bashrc (Ubuntu, etc) in their home folder. This file is a hidden file which can be opened using a vi or gedit editor
The command being
vi /home/pradeep/.bash_profile
vi /home/pradeep/.bashrc

or
gedit /home/pradeep/.bash_profile
gedit /home/pradeep/.bashrc
Similarly the same for user “kumar” (if you set the path for “pradeep” and running under “kumar”, it will not work, for that to work, there is a separate customisation is available), for beginners, these steps are enough.
T S Pradeep Kumar

Comments

Popular posts from this blog

Installing ns3 in Ubuntu 22.04 | Complete Instructions

In this post, we are going to see how to install ns-3.36.1 in Ubuntu 22.04. You can follow the video for complete details Tools used in this simulation: NS3 version ns-3.36.1  OS Used: Ubuntu 22.04 LTS Installation of NS3 (ns-3.36.1) There are some changes in the ns3 installation procedure and the dependencies. So open a terminal and issue the following commands Step 1:  Prerequisites $ sudo apt update In the following packages, all the required dependencies are taken care and you can install all these packages for the complete use of ns3. $ sudo apt install 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 libc...

Installation of NS2 (ns-2.35) in Ubuntu 20.04

Installation of NS2 (ns-2.35) in Ubuntu 20.04 LTS Step 1: Install the basic libraries like      $] sudo apt install build-essential autoconf automake libxmu-dev Step 2: install gcc-4.8 and g++-4.8 open the file using sudo mode $] sudo nano /etc/apt/sources.list Include the following line deb http://in.archive.ubuntu.com/ubuntu bionic main universe $] sudo apt update $] sudo apt install gcc-4.8 g++-4.8 Step 3:  Unzip the ns2 packages to home folder $] tar zxvf ns-allinone-2.35.tar.gz $] cd ns-allinone-2.35/ns-2.35 Modify the following make files. ~ns-2.35/Makefile.in Change @CC@ to gcc-4.8 change @CXX@ to g++-4.8 ~nam-1.15/Makefile.in ~xgraph-12.2/Makefile.in ~otcl-1.14/Makefile.in Change in all places  @CC@ to gcc-4.8 @CPP@ or @CXX@ to g++-4.8 open the file: ~ns-2.35/linkstate/ls.h Change at the Line no 137  void eraseAll() { erase(baseMap::begin(), baseMap::end()); } to This void eraseAll() { this->erase(baseMap::begin(), baseMap::end()); } All changes ...

Simulation of URDF, Gazebo and Rviz | ROS Noetic Tutorial 8

Design a User-defined robot of your choice (or you can use the URDF file) and enable the LIDAR Scanner so that any obstacle placed on the path of the light scan will cut the light rays. Visualize the robot in the Gazebo workspace, and also show the demonstration in RViz.   (NB: Gain knowledge on wiring URDF file and .launch file for enabling any user-defined robot to get launched in the gazebo platform.) SLAM : One of the most popular applications of ROS is SLAM(Simultaneous Localization and Mapping). The objective of the SLAM in mobile robotics is to construct and update the map of an unexplored environment with the help of the available sensors attached to the robot which will be used for exploring. URDF: Unified Robotics Description Format, URDF, is an XML specification used in academia and industry to model multibody systems such as robotic manipulator arms for manufacturing assembly lines and animatronic robots for amusement parks. URDF is especially popular with users of the ...