Sun Service sl-120 Shell Program Guide: August 1993

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"SL-120 Shell Program SG" 这份文档详细介绍了Sun Service公司于1993年8月发布的Shell编程指南，适用于学生学习和使用Shell编程。Shell Programming是系统级编程语言的一种，它提供了一种与操作系统交互的方式，使得用户可以通过命令行界面执行复杂的任务和管理计算机系统。在文档的"Credits and Trademarks"部分，强调了版权保护的重要性，所有内容未经Sun Service Inc.及其许可方的书面授权，不得任何形式复制、分发或解构。这份产品可能包含来自Unix System Laboratories的UNIX?和Berkeley 4.3 BSD系统的部分内容，这些是经过许可使用的。同时，还涉及到第三方字体软件，其版权和使用权受到Sun Font Suppliers的许可。值得注意的是，根据文档提及的"RESTRICTED RIGHTS LEGEND"，如果该Shell程序被美国政府使用、复制或披露，将受《国防采购条例》(DFARS)第252.227-7013(c)(1)(ii)条款和《联邦 Acquisition Regulation》(FAR)第52.227-19部分的限制。这意味着在特定的法律框架下，使用此产品可能受到某些条件约束。此外，文档还暗示了该Shell程序可能受到多项专利的保护，包括美国专利、外国专利申请等，这进一步强调了知识产权的法律保护。 SL-120 Shell Program SG是针对学生和Shell编程爱好者的实用教程，它不仅提供了编程基础，还包含了对版权、许可和受限权利的法律指导，确保用户在享受Shell编程乐趣的同时，尊重并遵守相关规定。

Available Shells

The Bourne Shell, written by Steve Bourne at AT&T Bell Labs, is the original UNIX shell.

It is the preferred shell for shell programming because of its compactness and speed. Its

main drawback is that it lacks features for interactive use such as the ability to recall previ-

ous commands (history). The Bourne Shell also lacks built-in arithmetic and logical

expression handling, making shell programs more difﬁcult to write and understand if you

currently work with a programming language similar to C.

The C Shell was one of the enhancements to UNIX carried out at the University of Cali-

fornia at Berkeley (UCB). The C Shell was written by Bill Joy while he was at Berkeley,

although he subsequently co-founded Sun Microsystems and presently serves as VP of

R&D for Sun. The C Shell was designed to incorporate features for interactive use such as

aliases and command history. It also included more convenient programming features

such as an arithmetic, "C-like" expression syntax. The syntax of C Shell programs is very

reminiscent of the "C" programming language, hence the name. These added features

make the C Shell preferable for interactive use, but they also make it larger and slower

than the Bourne Shell.

The Korn Shell, written by David Korn of AT&T Bell Labs, was designed to be compati-

ble with the Bourne Shell yet offer interactive features comparable to those in the C Shell.

The Korn Shell also includes convenient programming features such as built-in integer

arithmetic, arrays, functions, and string manipulation facilities. The Korn Shell is faster

than the C Shell, and will run scripts written for the Bourne Shell.

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Sun Service sl-120 Shell Program Guide: August 1993

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