Hello,
I can run simulations scripts successfully as a root user but when I run the same script as a user other than root, I get this error message:

Although, "ns" command shows the "%" sign. Please guide.
Regards.

May be you did set all the PATH's as root ? ?

"Users" have their own path's , and the ns-allinone
path's must be set for each user.
.....
Or avoid having any PATH issues at all, just install
a few files into the system path's , post # 13 here
http://www.linuxquestions.org/questi...ora-11-750634/
.....
.....
Other ns2 info : LQ Search > > Tagname = ns2
.....

Using ' ex1.tcl ' : The command is : ' ns ex1.tcl '.
If you do ' ns <Enter> ' , you get the ' ns shell ',
which is for other purpose.
.....

Thanks knudfl.
But I have already edited the ~/.bashrc separately for the other user. And the paths are set correctly I am sure. Even then this happens ?

I guess, you will have to build ns-allinone in your /home/
to have the right permissions.
/root/ is not the location to keep it in. No users can read or
access that directory, and thus not use any files inside /root/.
/root/ is not supposed to be used for anything . Never !

A standard build location : /home/'user'/ns2/ns-allinone-2.32/
but /usr/local/ns2/ may be usable too.

Now I have changed the ns2's location to /home/Program_Files/ns-allinone-2.32/. I have also run these commands:

And edited and 'source'd the .bashrc accordingly but still get same message.

" chown -R mq15 /home/Program_Files " etc.

Looks for me, that you just moved or copied the whole
folder ns-allinone-2.32/ from /root/ ? ?

And the "new folder" is not to be in /home/'new-folder',
but /home/"user"/'new-folder'/ . Else you will have
similar permissions problems again. !


Better start from scratch in another folder with a new
name like /home/mq15/ns2/ to be absolute sure for it
to work.
And please run all commands as the ordinary user. No 'su'.

By the way : The latest version is ' 2.34 '.

And please consider this again :
http://www.linuxquestions.org/questi...ora-11-750634/
→ → post # 13 : Makes everything much much easier. ... ...
.....

Please suggest me solution considering me as a newbie. I am not familiar to Linux environment at all.

Well then let us try this :

Log in to your username.

Open the terminal window and type ...
1) mkdir ns2
2) cd ns2/
3) ... ... ... ... copy or move the ns-allinone-2.32.tar.gz into ns2/
4) tar xvf ns-allinone-2.32.tar.gz
5) cd ns-allinone-2.32/
6) ./install
..... And please use the finishing text to set the new paths.
..... May be copy / paste that text to a text file to have a backup.
.....
.....
.....

Thanks knudfl for your help...
The problem has been solved. I removed ns-allinone-2.32, installed ns-allinone-2.34, updated ~/.bashrc and sourced it. Then updated and sourced the ~/.bashrc separately for other user.