How to get rid of dot/slash when running executables on Linux

... and why you shouldn't be doing this unless it is absolutely necessary.

But anyway, sometimes there is this old/legacy program that tries to execute another program inside the same directory without the dot/slash, and we don't have access to its source code or we don't wanna access its source code (for reasons apparent to a CS person)

Here: http://www.linfo.org/dot_slash.html

Have fun.