Advanced Unix programming (SAMS) by Gay W.

By Gay W.

This can be a ebook approximately UNIX programming. It begins with easy recommendations and ends with assurance of complicated issues. it's a self-teaching advisor, and but it features as a UNIX reference booklet. The examples supplied are written within the C and C++ languages. The examples are brief courses, every one meant to illustrate use of a selected programming facility. The C++ courses are written as easy courses and will be good understood through those who don't application in C++. This ebook makes an attempt to be UNIX platform impartial. during the e-book, variations in performance are famous in your comfort. this may prevent time should you needs to write initiatives that needs to be UNIX transportable. FreeBSD 3.4 unlock is used all through this booklet for demonstration reasons. This promises that the instance courses will bring together and run with none extra attempt on that platform. This additionally offers a selected point of performance, for the reason that a few capabilities are missing or differ on different structures. you could receive FreeBSD from the web or buy it on a CD-ROM at a nominal fee. this permits you to paintings throughout the booklet on a platform that's on a par with different specialist UNIX structures.

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To make sure that this is not the case, most users set their terminal to the lowest common denominator as follows: TERM=vt100 When I introduce the case statement in Chapter 10, "Flow Control," you will see a more advanced method of setting the terminal type that enables access to advanced terminal features. Setting the PATH When you type the command $ date the shell has to locate the command date before it can be executed. The PATH specifies the locations in which the shell should look for commands.

Sams Teach Yourself Shell Programming in 24 Hours Hour 2: Script Basics Sections in this Chapter: The UNIX System Shell Initialization Getting Help Summary Questions Terms © Copyright Macmillan Computer Publishing. All rights reserved. Contents Index Previous Chapter Next Chapter Previous Section Next Section Sams Teach Yourself Shell Programming in 24 Hours Hour 2: Script Basics Sections in this Chapter: The UNIX System Shell Initialization Getting Help Summary Questions Terms Contents Index Previous Chapter Next Chapter Previous Section Next Section Terms Utilities Utilities are programs, such as who and date, that you can run or execute.

Cat follows: To view the content of a file, use the cat (short for concatenate) command. Its syntax is as cat files Here files are the names of the files that you want to view. edu loopback kanchi kashi soda Numbering Lines The cat command also understands several options. One of these is the -n option, which numbers the output lines. edu loopback kanchi kashi soda The numbered output shows us that the last line in this file is blank. edu loopback kanchi kashi soda Although the blank line is still there, it is no longer numbered.

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