Hello sir/ma

i have some challenges in installing network simulation NS2 on my Ubuntu 16.04

Whenever i trying to configure and modify the bash file by using this command sudo gedit .bashrc

to add this file below to the existing bash file

# LD_LIBRARY_PATH
OTCL_LIB=/home/ojo/Documents/ns-allinone-2.35/otcl-1.14/
NS2_LIB=/home/ojo/Documents/ns-allinone-2.35/lib/
USR_Local_LIB=/usr/local/lib/
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$OTCL_LIB:$NS2_LIB:
$USR_Local_LIB
# TCL_LIBRARY
TCL_LIB=/home/ojo/Documents/ns-allinone-2.35/tcl8.5.10/library/
USR_LIB=/usr/lib/
export TCL_LIBRARY=$TCL_LIBRARY:$TCL_LIB:$USR_LIB
# PATH
XGRAPH=/home/ojo/Documents/ns-allinone-2.35/xgraph-12.2/:/home/ojo/Documents/ns-allinone-2.35/bin/:/home/ojo/Documents/ns-allinone-2.35/tcl8.5.10/unix/:/home/ojo/Documents/ns-allinone-2.35/tk8.5.10/unix/
NS=/home/ojo/Documents/ns-allinone-2.35/ns-2.35/
NAM=/home/ojo/Documents/ns-allinone-2.35/nam-1.15/
export PATH=$PATH:$XGRAPH:$NS:$NAM



Then it gives error message:

** (gedit:2287): WARNING **: Set document metadata failed: Setting attribute metadata::gedit-encoding not supported.

please i need your urgent help to solve this problem so that i can continue with my installation.

Thank you.

First, this is NOT URGENT for anyone here, at all. We volunteer our time, so asking for/expecting 'urgent' help is plain rude. Secondly, gedit is only an editor...you are free to use any OTHER editor to edit that file. Chances are, you're logged in as a 'regular' user, and trying to run gedit as root...which can't connect to the X session, so it's dying. Either open the file in another editor, or change permissions on that TCL file so you can edit it as a regular user.

sorry if i have been rude with my approach. i appreciate your contribution. i am novice and still learning about the whole process. i only got to this level of installation through study. But now i am stuck with the installation and i could not move forward again after spending a whole day on the installatio. This is the reason i seek for help. i will really appreciate better explination on this.

Thank you sir

There is no 'better explanation', if what was said makes no sense. It's as simple as it gets...you can't run gedit as root via sudo. Run it as your normal user. Edit the file. Or, edit it with vi, emacs, nano, or any one of about a hundred OTHER editors. Pick one.

@Adaramola ojo jayeola : Welcome to LQ.

You are not supposed to add any *PATH text to .bashrc . Not required.
The old year ~1999 text is about a University computer, with you having no write permissions to /usr/.
And : The executable 'ns' or "ns-<any-name>" is hard coded to know the location of it`s libraries:
ns-allinone-2.35/{ lib/*/*, bin/tcsh8* }.

This is how it's done :
cd ns-2.35/
sudo make install ('make install' will copy 'ns' to /usr/local/bin/, i.e. a system path)
cd ../nam-1.15/
sudo make install

Xgraph : sudo apt-get install xgraph


-