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The programmer had a clever idea. He would put a bunch of code in an:
if (debugging)
statement. He would then run the program and when he wanted debugging output, he would use the interactive debugger to change debugging from 0 to 1. But his code was about to surprise him.
1 /***********************************************
2 * Code fragment to demonstrate how to use the *
3 * debugger to turn on debugging. All you *
4 * have to do is put a breakpoint on the "if" *
5 * line and change the debugging variable. *
6 ***********************************************/
7 extern void dump_variables(void);
8
9 void do_work()
10 {
11 static int debugging = 0;
12
13 if (debugging)
14 {
15 dump_variables();
16 }
17 // Do real work
18 }
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Making files is easy under the UNIX operating system. Therefore, users tend to create numerous files using large amounts of file space. It has been said that the only standard thing about all UNIX systems is the message of the day telling users to clean up their files.
— Early UNIX administrator's guide
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