605 B

PATH_MAX limit.

In case you rush into the problem, that you have more slides than PATH_MAX, which is more than four thousand slides, there is a solution with catpoint(1):

  1. Make a temporary file with the content of your presentation.
  2. Create some application to update the temporary file content.
  3. Either press reload or use SIGHUP to reload the file and slide.

Using this solution you lose some commands in catpoint(1) but will be able to scale to infinity.

Another solution would be to use some different kernel or userspace, allowing more arguments to a command.

Have fun!