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4.2 UNIX development tools under Mac OS X
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Mac OS X comes with many of the UNIX tools and userland programs that experienced users are accustomed to, including emacs, vi, more, top, ps, sed, and awk. Once you install the Apple developer tools, you get most of the standard UNIX development programs as well. These include perennial favorites like gcc, g++, gdb, and Perl. Before looking at what editors are available on Mac OS X, let s briefly review the design and categories of UNIX editors.
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4.2.1 Editors Programmers probably spend more of their work life creating and editing text files. Consequently, the demand for and development of high quality, customizable, stable text editors and text manipulation tools has been a very high priority from the inception of UNIX. Historically, we can partition UNIX editing tools into two categories: interactive editors (including both line and screen mode editors) and non-interactive editors (stream editors).
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Line-mode editing Line-mode editing grew from the era of time-sharing and is personified by ed, the so-called standard UNIX editor. The ed program, developed by Ken Thompson, embodies many of the features common to line-mode editing tools. The ed text editor operates in one of two modes: command mode or input mode. In command mode, you enter commands that invoke editor operations, such as deleting a line in a file or searching for a string. These operations transform a line or file but do not display the result immediately; you need to enter a display command to see the result of the operation. Input mode enables you to insert new text into a file. An obvious question is why you should take the time to learn about line-mode editing tools. Line-mode editing commands are still used in some current programs, such as vi. And, some Cocoa applications use UNIX command-line tools such as ed for performing many operations, so understanding the basics of these tools will help you build your own programs that use UNIX tools.
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UNIX development tools under Mac OS X
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Screen-mode editing Screen-mode editors embody a different design principle and user experience than line-mode editors. Whereas line-mode editors let you interact with a file or a single line at a time, screen-mode editors display a screen of text at a time, enabling you to edit text on the entire screen and see the result of an editing operation immediately. More or less, this is what you are accustomed to today. GNU emacs (based on TECO) and vi are the most popular examples of screen editors. (Actually, vi contains two interaction modes: line and screen mode. Today we call the editor vi, but technically it is the visual mode of ex, line-mode editing program based on ed.) Stream-mode editing Stream-mode editing enables you to quickly apply editing commands over one or more files without opening the files in an editor. You specify commands (either on the command line or in a script file) and a set of files as program parameters. The stream-editing program applies the editing commands to each file and outputs the new, transformed text. The most popular stream-editing program is sed. It has been around since the early days of UNIX; over the years it has become less popular, primarily due to the development and popularity of scripting languages such as Perl, Python, and Ruby. However, sed is still a very useful and powerful editing tool. For example, it accepts input from standard input, so you can easily pipe a text file into sed, have it apply the editing commands to the input, and output the new text, all in one command. You can use stream-mode editing tools for Mac OS X development. For example, FileMerge, a GUI-based file comparison and merging program located in the /Developer/Applications folder, is implemented as a GUI application that uses the UNIX diff command, outputting its result to an ed script. Later in the chapter you ll see how this works; for now, look at figure 4.1, which shows the result of searching the process table for the diff command as FileMerge is comparing two large files. As you can see from this example, there is still a place for UNIX command-line tools in the modern age!
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