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CHAPTER 5: C Basics: Variables and Operators
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Building slasher the Unix Way
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This section is completely optional. You can skip it entirely, or scan it to follow along, or do every darned step along the way. We re going to use Terminal to compile the slasher source code into a runnable Unix application. In effect, we re going to rebuild the slasher application that you just ran. In your home directory, create a new folder called slasher. Your home directory is the directory with the house icon, named with your login name. For example, my home directory is in the Users folder and is called davemark. Next, locate the folder containing the slasher project. You ll find it in the Learn C Projects directory, in the 05.03 - slasher subdirectory. Inside that folder, you ll find a file named main.c, which contains the slasher source code. Use the Finder to drag a copy of main.c into the new slasher folder you created in your home directory. If Terminal is running, open a new window by selecting New Window from the Shell menu. If Terminal is not running, launch it. You ll find it in the Applications folder, in the Utilities subfolder. At this point, you should have a slasher folder in your home folder containing a copy of slasher s main.c file and a new Terminal window, which looks like the one shown in Figure 5-10.
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Figure 5-10. A brand-new Terminal window
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CHAPTER 5: C Basics: Variables and Operators
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We re now going to type some Unix commands into the Terminal window. Our first goal is to make sure we can see the new slasher folder we just created in our home directory. Type this command, followed by a carriage return:
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Note that there is a space in between the cd and the tilde character (~). This command tells Unix to change your directory (cd) to the home directory in Unix-speak, the tilde directory is always your home directory. Next, you ll type this command
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followed by a carriage return. This command asks Unix to list all the visible files in the current directory, which, in this case, is your home directory. Here s the list I got:
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Desktop Documents Library Movies Music Pictures Public Sites slasher
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Note that our newly created slasher directory is in this list. If you don t see slasher in your list, chances are good that you created the directory in the wrong place. Go find the folder and drag it into your home directory. Then, go back to Terminal, and do another ls. Next, let s go into the slasher directory and make sure the main.c file is there. Issue these two commands:
cd slasher ls
Remember to type a carriage return after each command. The first command changes directories to the slasher directory. The second command lists the visible files in that directory. Here s the result of my ls:
main.c
If your slasher directory is empty, you did not successfully copy main.c into the slasher folder you created. Go fix that. Once ls shows main.c in the slasher directory, you are ready to do a compile. Type this command:
cc -o slasher main.c
CHAPTER 5: C Basics: Variables and Operators
Be sure to end it with a carriage return. You ve just asked Unix to compile the C code in the file main.c and link the resulting object code into an executable file named slasher. The -o tells the cc command that you want to name the output, the word slasher tells it the name to use. If you left -o slasher out of the command, cc would put the output in a file named a.out.
Which Compiler Did You Run
In the Unix world, cc is a command, and -o slasher is a switch that modifies the command. The command cc asks Unix to find and run the C compiler. Interestingly, you can have multiple C compilers installed on your computer. All Unix users have a search path associated with their accounts that Unix uses to find programs they ask it to run. Try this command:
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