What is the LD_PRELOAD trick?

Question

I came across a reference to it recently on proggit and (as of now) it is not explained.

I suspect this might be it, but I don\'t know for sure.

Answer 1

it's easy to export mylib.so to env:

$ export LD_PRELOAD=/path/mylib.so
$ ./mybin

to disable :

$ export LD_PRELOAD=