Title:  UNIX Shell Patterns  (9 pages)
Authors:
	Jim Coplien, cope@bell-labs.com
	ILL650 1G341
	1000 East Warrenville Road
	Naperville, IL  60566

	Alan Robertson, alan.l.robertson@lucent.com
	COF100  31F-018
	11900 N. Pecos St
	Westminster
	CO  80234-2703

	Gregg Wonderly, gregg.wonderly@lucent.com
	ILI800 1V421
	1200 E. Warrenville Road, P. O. Box 3045
	Naperville
	IL  60566-7045

	All are affiliated with Lucent Technologies, Bell Labs Innovations

Abstract:

	Shell has emerged as a family of programming languages for the UNIX (R)
	Operating System in the same sense that JCL emerged as a programming
	language for mainframe job control in the 1960s.  It is a family of
	languages because we find variant syntaxes and capabilities in the
	Bourne shell, the Korn shell, the C shell, and others.  Most of
	the patterns described here apply equally well to all these variants.

	These patterns do not form a full pattern language nor are they a
	comprehensive collection of patterns for the "architecture" of a Shell
	program.  They cover frequent Shell programming problems that often
	are resolved only with expert insight.