Download PDF by Gay W.: Advanced Unix programming (SAMS)

By Gay W.

This can be a e-book approximately UNIX programming. It begins with easy options and ends with insurance of complicated subject matters. it's a self-teaching consultant, and but it capabilities as a UNIX reference e-book. The examples supplied are written within the C and C++ languages. The examples are brief courses, every one meant to illustrate use of a specific programming facility. The C++ courses are written as basic courses and will be good understood via those who don't application in C++. This e-book makes an attempt to be UNIX platform impartial. through the publication, adjustments in performance are famous to your comfort. this may prevent time if you happen to needs to write initiatives that has to be UNIX moveable. FreeBSD 3.4 free up is used all through this e-book for demonstration reasons. This promises that the instance courses will collect and run with none extra attempt on that platform. This additionally offers a particular point of performance, because a few services are missing or range on different systems. you could receive FreeBSD from the net or buy it on a CD-ROM at a nominal fee. this permits you to paintings during the ebook on a platform that's on a par with different expert UNIX structures.

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Book Page 45 Monday, December 15, 2003 11:27 AM This strategy holds true across the board with Unix, and that’s why the scripts in this chapter — and throughout the book — not only are helpful, but are a logical extension of the entire Unix philosophy. After all, ’tis better to extend and expand than to build complex, incompatible versions of commands for your own installation. #14 Formatting Long Lines If you’re lucky, your Unix system already includes the fmt command, a program that’s remarkably useful if you work with text with any frequency.

To understand this notation, realize that the apparent gobbledygook is really two nested string slices. }, extracts everything but the first character of the variable var (? book Page 13 Monday, December 15, 2003 11:27 AM expression that matches one character). Next, the call ${var%pattern} produces a substring with everything left over once the specified pattern is applied to the inner call. In this case, what’s left is the first character of the string. This is a pretty dense explanation, admittedly, but the key to getting checkForCmdInPath to work is for it to be able to differentiate between variables that contain just the program name (like echo) and variables that contain a full directory path plus the filename (like “/bin/echo”).

2 exit 1 fi #5 Validating Integer Input As you saw in Script #2, validating integer input seems like a breeze until you want to ensure that negative values are acceptable too. The problem is that each numeric value can have only one negative sign, which must come at the very beginning of the value. The validation routine in this script makes sure that negative numbers are correctly formatted, and, to make it more generally useful, it can also check that values are within a range specified by the user.

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