Introduction to the C Shell
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Description: Copy of Bill Joy's original memo.
An Introduction to the C shell USD:4-1 An Introduction to the C shell William Joy (revised for 4.3BSD by Mark Seiden) Computer Science Division Department of Electrical Engineering and Computer Science University of California, Berkeley Berkeley, California 94720 ABSTRACT Csh is a new command language interpreter for UNIX systems. It incorporates good features of other shells and a history mechanism similar to the redo of INTERLISP. While incorporating many features of other shells which make writing shell programs (shell scripts) easier, most of the features unique to csh are designed more for the interactive UNIX user. UNIX users who have read a general introduction to the system will find a valuable basic explanation of the shell here. Simple terminal interaction with csh is possible after reading just the first section of this document. The second section describes the shell's capabilities which you can explore after you have begun to become acquainted with the shell. Later sections introduce features which are useful, but not necessary for all users of the shell. Additional information includes an appendix list- ing special characters of the shell and a glossary of terms and commands introduced in this manual. Introduction A shell is a command language interpreter. Csh is the name of one particular command interpreter on UNIX. The primary pur- pose of csh is to translate command lines typed at a terminal into system actions, such as invocation of other programs. Csh is a user program just like any you might write. Hopefully, csh will be a very useful program for you in interacting with the UNIX system. _________________________ UNIX is a trademark of AT&T Bell Laboratories. USD:4-2 An Introduction to the C shell In addition to this document, you will want to refer to a copy of the UNIX User Reference Manual. The csh documentation in section 1 of the manual provides a full description of all fea- tures of the shell and is the definitive reference for questions about the shell. Many words in this
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