Bell Labs

Jobs:

Writing software for BISCUS (Business Information Systems Customer Information Systems)
System integration testing of 8 component programs making up the whole system
Testing UNIX operating system development, used in the system testing work.
Customer site coordinator for the installation for the first electronic switch, which resided in central offices and routes calls for communities.
Design team for software for new competitive telephone companies starting after the breakup of the Bell System.
Part of the proposal team for outsourcing telecomm and software to for the County of San Diego. This project was worth over $500 million over 7 years.

UNIX contribution:
As part of the system testing I found a need for a new unix command for the unix command line interface OR shell also considered a programming language, and worked with John Mashey, one of the unix developers, for requirements. The sed (String Editor) Command was the result. It is still part of UNIX command language interface or shell (terminal) programing language shipped in all Macintosh computers.

NAME
sed – stream editor

SYNOPSIS
sed [-EHalnru] command [-I extension] [-i extension] [file ...]
sed [-EHalnru] [-e command] [-f command_file] [-I extension]
[-i extension] [file ...]

DESCRIPTION
The sed utility reads the specified files, or the standard input if no files are specified, modifying the input as specified by a list of commands. The input is then written to the standard output.

A single command may be specified as the first argument to sed. Multiple commands may be specified by using the -e or -f options. All commands are applied to the input in the order they are specified regardless of their origin.

Simplistic example:
Change the word USA to United States of America
The pipe function "|" is an important function of unix shell. It sends the output of one program to the input of another.