摘要：Most UNIX machines store their files on magnetic disk drives. A disk drive is a device that can store information by making electrical imprints on a magnetic surface. One or more heads skim close to t... 阅读全文

摘要：This section discusses tips and tricks to make your use of the shell more efficient. File name completionBoth ksh and csh will perform file name completion for you. You can type in a partial file name... 阅读全文

摘要：The UNIX shell is a actually a user program that the kernel runs for you when you log in. There is usually more than one shell available on most UNIX systems. The most common shells available on UNIX ... 阅读全文

摘要：CONCEPT: The exact behavior of commands issued in the shell depends upon the execution environment provided by the shell. The UNIX shell maintains a set of environment variables that are used to provi... 阅读全文

摘要：One of the most basic operations you will need to perform on a UNIX system is text editing. Whether you are preparing a document, writing a program, or sending email to a colleague, you will need a ut... 阅读全文

摘要：When you log in to a UNIX system, the kernel starts a shell for you, and connects the shell to your terminal. When you execute a command from the shell, the shell creates a child process to execute th... 阅读全文

摘要：CONCEPT: The UNIX kernel can keep track of many processes at once, dividing its time between the jobs submitted to it. Each process submitted to the kernel is given a unique process ID. Single-tasking... 阅读全文

摘要：CONCEPT: UNIX allows you to connect processes, by letting the standard output of one process feed into the standard input of another process. That mechanism is called a pipe. Connecting simple proces... 阅读全文

摘要：CONCEPT: Every program you run from the shell opens three files: Standard input, standard output, and standard error. The files provide the primary means of communications between the programs, and ex... 阅读全文

摘要：Here is an index to the topics in this section: The UNIX filesystem structure File and directory permissions Changing directories Listing the contents of a directory ... 阅读全文

摘要：The shell is perhaps the most important program on the UNIX system, from the end-user's standpoint. The shell is your interface with the UNIX system, the middleman between you and the kernel. CONCEPT... 阅读全文

摘要：To ensure security and organization on a system with many users, UNIX machines employ a system of user accounts. The user accounting features of UNIX provide a basis for analysis and control of system... 阅读全文

摘要：There are many ways that you can access a UNIX system. The main mode of access to a UNIX machine is through a terminal, which usually includes a keyboard, and a video monitor. For each terminal connec... 阅读全文

摘要：UNIX is an operating system. The job of an operating system is to orchestrate the various parts of the computer -- the processor, the on-board memory, the disk drives, keyboards, video monitors, etc. ... 阅读全文

摘要：When you log onto a UNIX somputer, the sustem runs a program called shell that gives you a prompt and wait for you type sommands, one per line. When you type a command and hit , the shell tries to exe... 阅读全文

摘要：Ctrl-D allows you to leave the computer properly. cpallows you to copy files echo $shell displays the shell that you are currently runing existends a ... 阅读全文

摘要：a computer system consists of several hardware and software components. the primary hardware componets of a typical computer system includ a CPU, main memory disk drives, a key board, a mouse , a disp... 阅读全文