Behavioral Study of UNIX Commands in a Faulty Environment

In this paper we propose the use of two approaches to tackle the detection and comprehension of how a faulty environment affects process behavior. We model processes as state-transition models with associated transition probabilities. The study employs SWIFI (Software Implemented Fault Injection) in commonly used UNIX tools to analyze behavioral changes. The approaches complement each other as one allows the detection of dissimilar behaviors and the other the analysis of how relationships among process states evolve over time. Obtained results are promising, as they allow a clear characterization of process execution in a normal and a faulty environment.