You may want to get GNU Software's version of diff from prep.ai.mit.edu. It compiles nicely on the IRIS and handles binary files. -- -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Steve Dahmen, Systems Analyst (804) 864-4519 (W) M/S 365, NASA Langley Research Center Hampton, Virginia 23665 smd at rehder.larc.nasa.gov