By Douglas W. Topham

A process V advisor to UNIX and XENIX takes the amateur reader during the good points of the UNIX process step by step with out jargon and assumptions in regards to the reader's technical wisdom present in comparable books. With its transparent motives, quite a few examles, and easy association, this booklet appeals to many non-technical humans simply commencing to paintings with UNIX, in addition to engineers and programmers with past event. a person who reads this e-book will how you can use the beneficial properties of UNIX, and the way to switch and customise these positive aspects. it really is prepared in the sort of manner that it leads the reader from the UNIX fundamentals to the extra complicated and robust strategies comparable to shell-programming and networking. even if the e-book is written as creation and reference for the UNIX person, it may possibly rather well be used as a textbook in undergraduate computing device technology or laptop engineering courses.

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If you try to initiate too many background processes at once, you may run the risk of overloading your system. FINDING OUT WHAT PROCESSES ARE RUNNING ps If you are running processes in the background, there is another UNIX command to find out which ones are still running at a particular moment and which have been completed. The ps (process status) command lists all processes currently running, displaying for each process its assigned process identification number (PID), the terminal on which it was initiated (TTY), the amount of time it has been running (TIME), and something to indicate the command line used to initiate it (COMMAND), as in this example: $ ps PID 1905 2132 2167 2218 $ - TTY 12 12 12 12 TIME 1: 16 2:18 4:02 0:58 COMMAND -sh ed -sh ps 2.

In most cases, you won'tj [ actually see the line erasedj the cursor will simply drop down to the next li ne $ fate date_ [Retype the line] Now press the (RETURN) key to have the command line executed. In this simple example, pressing the @ key to erase the line instead of pressing ( CTRL- H) four times to erase four characters separately saved you only three keystrokes. However, on a long command line, it would save you many more keystrokes. RESTORING THE PROMPT Sometimes, after you have started a process, the process hangs and the UNIX shell prompt ($) does not return to the screen.

Command options are usually designated by a hyphen (or minus sign), followed by a single letter (also called a switch). Sometimes you can type more than one letter after a single minus sign (to indicate multiple options); sometimes you cannot. In a few instances, command options are designated by plus signs instead of minus signs. Many commands allow one or more input files to be named. (Output files are generally, but not always, designated by an output option switch like -0. ) The various options and filenames that follow the command are referred to, collectively, as arguments.

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