Perl - Intro to Debugger

Perl is a general-purpose, higher level translated and lively programming language. Since Perl is much like other popular languages syntactically, it's a lot easier to code and find out from Perl. But ideal programs are tough to acquire at the very first effort. They need to go through various measures of debugging to repair all mistakes. These applications will contain some bugs that result from the collapse of code implementation.

What's a bug?

That is to say, once we make a mistake during communicating we call it a bug.

The practice of discovering and eliminating software mistakes which result in collapse of this program is called debugging. The debugging period begins just after having a bug report also finishes when that bug is eliminated and the application is functioning properly.

How it's done?

The debugging process involves removal and detection of bugs from applications programs.

- Replication of insect: Here is actually the very first step in debugging, where we attempt to recreate the measures which resulted in the collapse of application by providing exactly the exact same pair of inputs.

- Recognizing the bug: In this measure, we attempt to examine the motives which resulted in the collapse of this program. We might need to thoroughly comprehend the program implementation for this. Therefore, a debugger assists in this process by providing better mechanics to comprehend the application. It inspects the app line-by-line, can pause the program using breakpoints, utilizes view to keep track of factors, registers, etc..

- Finding the insect: Once we understand the wrong behaviour, we plan to discover the part of source code which creates this error. This action is called finding the insect. To do so, we might need to inspect the source code, see variable alterations, etc..

- Fixing the bug along with re-testing of application: Here is the last measure of debugging, in which we fix the bug in the application program. Then we need to re-test the app and see whether the bug is eliminated and all corrections have been set up. In this step, it's likely that some other parts of the app may get influenced also. Consequently an impact analysis might need to be done to identify the affected parts and re-test them.

To enter debugger, we could sort the following command:

perl -d program_name

perl -d program_name

Exiting the Debugger

To exit from the debugger we can press q or use:

Ctrl+D or Ctrl+Z