This is the source code for YankIt, a command-line program that unpacks files from ShrinkIt archives. It was written for the Apple IIgs in 1992. The code was written for the Orca/M assembler.
The features and usage are described in the original readme.
The program has a bug that will cause it to fail on some compressed data. This is noted in the code (see shk.asm) but I never got around to fixing it.
A ShrinkIt archive is included here that has the original source code and an executable binary.