UT theoretical chemistry code forum

I put the file "nebmake.pl" into a directory, and want to get 5 images. I used this command line:

nebmake.pl ./5im/00/POSCAR ./5im/06/POSCAR 5

But it appears:

nebmake.pl: Command not found.

I am using the unix system of the University.

What's wrong with me?

Thanks for your help!