Using diff and patch

Quite often, we wish to know the differences between two versions of a file or a group of files, which may be organized in a directory tree. We wish to be sure that work done is as desired and no errors have been introduced inadvertently in the file(s).… Read more

Concurrent activities

The Agile Concurrent Software Process

by Karunesh Johri


The major activities required in a software development life cycle (SDLC) were identified in the waterfall model. The agile concurrent software process model proposes that the activities identified in the waterfall model are not done sequentially; these activities progress concurrently with varying intensities during the entire software life cycle.

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The making of UNIX Operating System

Unix quotation by Thompson and Ritchie



Compatible Time-Sharing System, CTSS, was developed at MIT under Project MAC. It was one of the first time-sharing operating systems, demonstrated in 1961 and was in use till 1973. CTSS was used on IBM 7094 and was "compatible" with standard batch processing OS for 7094, the Fortran Monitoring System (FMS); it ran a copy of FMS in background.… Read more