How do you find out if looking up a film :

If it was released in the theater or not. Or if it was only direct to video? It doesn't say anywhere this information.

For example it does not say whether this one was:  Deadly Prey:  www.imdb.com/title/tt0100943/

Or:    www.imdb.com/title/tt0093146/?ref_=nv_sr_srsg_0

Or:  www.allmovie.com/movie/robot-jox-v41708