What is the KornShell Language?
The KornShell language was designed and developed by David G. Korn at AT&T Bell Laboratories. It is an interactive command language that provides access to the UNIX system and to many other systems, on the many different computers and workstations on which it is implemented.
The KornShell language is also a complete, powerful, high-level programming language for writing applications, often more easily and quickly than with other high-level languages. This makes it especially suitable for prototyping.
There are two other widely used shells, the Bourne shell developed by Steven Bourne at AT&T Bell Laboratories, and the C shell developed by Bill Joy at the University of California. ksh has the best features of both, plus many new features of its own. Thus, ksh can do much to enhance your productivity and the quality of your work, both in interacting with the system, and in programming. ksh programs are easier to write, and are more concise and readable than programs written in a lower-level language such as C.
The KornShell language uses the same syntax for built-in commands as for non-built-in commands. Therefore, system developers can add new commands “transparently” to the KornShell language; that is, with minimum effort and with no differences visible to users other than faster execution. On systems with dynamic linking, it is possible to add new built-in commands at run time. Novell has extended the new version of ksh to enable X-windows programming for their desktop ksh product, dtksh. dtksh is a standard part of CDE, the Common Desktop Environment defined by COSE (Common Operating System Environment), supported by most major UNIX system hardware vendors. An extended version of ksh that enables Tk programming, called tksh, is available as well.
to add new built-in commands at run time. Novell has extended the new version of ksh to enable X-windows programming for their desktop ksh product, dtksh. dtksh is a standard part of CDE, the Common Desktop Environment defined by COSE (Common Operating System Environment), supported by most major UNIX system hardware vendors. An extended version of ksh that enables Tk programming, called tksh, is available as well.
The Korn shell’s major new features include:
- Command-line editing, allowing you to use vi or emacs-style editing commands on your command lines.
- Integrated programming features: the functionality of several external UNIX commands, including test, expr, getopt, and echo, has been integrated into the shell itself, enabling common programming tasks to be done more cleanly and without creating extra processes.
- Control structures, especially the select construct, which enables easy menu generation.
- Debugging primitives that make it possible to write tools that help programmers debug their shell code.
- Regular expressions, well known to users of UNIX utilities like grep and awk, have been added to the standard set of filename wildcards and to the shell variable facility.
- Advanced I/O features, including the ability to do two-way communication with concurrent processes (coroutines).
- New options and variables that give you more ways to customize your environment.
- Increased speed of shell code execution.
- Security features that help protect against “Trojan horses” and other types of break-in schemes.
According to Indeed’s latest reports, Korn Shell professional is paid around $225k
GoLogica is offering Korn Shell Online Training. This course will lead you to successfully clear the examination which will get you to be a certified Korn Shell Developer. This program is called Korn Shell Training. With this course you would be able to understand the methodologies, implementation and Integrations for every kind of project.
At the end of this course, you will receive a course completion certificate which certifies that you have successfully completed GoLogica training in Korn Shell technology.You will get certified in Korn Shell by clearing the online examination with a minimum score of 70%. To help you prepare for a certification exam, we shall provide you a simulation exam and a practice exam.