to use ns in a shared directory

[Fusun Inanc <fusun@poptop.ee.psu.edu>]

Hi everyone,

I have installed ns-allinone-2.1b5 on to my Sun Solaris 2.7 unix server.
In my lab, three students are using ns for their projects. I cannot install 
ns in three different directories because I don't have this much space in the 
server. And also later on the number of students who use ns might increase .
Instead we all have to use the same source of ns. 

For this purpose I created a common user in my unix system and installed ns in 
to this user's home directory. and give permission to the group to use these 
files. 

But this cause the problem. Everytime whenever one of us compiles ns, the 
permission of some files is changed to that user as wrx and group permission is 
gone. And whenever the other user wants to compile it s/he has problems like 
permission denied...

How can I solve this problem.  Any help on this will be greatly appreciated.

Thanks in advance.

Fusun Inanc