What is that in Ruby, Python Perl that they get executed on command line and can be used in system admin work while PHP and Java etc can not be used?

Question

Why can't we make a language say for eg Java also to be working like them? Is it purely a design decision or something else?

Answer 1

Nothing.

Every system that can run Java at all, and that can run Ruby, Perl, or Python programs from the command line can also run Java programs from the command line. I do it every day on Windows and Linux, for example.