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UNIX shells

There are several “shells” that are available to support UNIX commands. A shell can be thought of as a scripting environment, and each shell has different syntax, so it is important that you know what shell you are using when you enter UNIX commands. In this book we will use the Korn shell, but you can write Oracle scripts using any of the available shells.

  • Bourne Shell (sh) - The Borne shell was the original UNIX command processor, which was developed at AT&T by Stephen R. Bourne in the early 1970s. This is the official shell that is distributed with UNIX systems. The Bourne shell is the fastest UNIX command processor.

  • Bourne Again Shell (bash) - Many UNIX purists prefer the Bourne Again shell, also known as the bash shell.

  • C Shell (csh) - Another command processor, developed by William Joy and others at the University of California in the early 1980s, is known as the C shell. The C shell borrows many concepts from the C language, and offers greater versatility than the Bourne shell.

  • Korn Shell (ksh) – Another popular command processor was developed by David Korn in the early 1980s, and is appropriately called the Korn shell. The Korn shell combines many of the best features of the earlier command processors, and it is gaining in popularity among Oracle DBAs. All of the shell scripts in the book are Korn shell scripts.

The above is an excerpt from the "Oracle9i UNIX Administration Handbook" by Oracle press, authored by Donald K. Burleson.




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