Summary - Command line

Combine argc, getopt and exit to write a CLI tool.

Designing a command handler

In this summary you'll combine argc/argv, getopt and exit to write a command handler. The handler walks a fixed command list and prints each one.

The structure: define a command array, loop over each with for, and print with printf. Finally end with printf("Tamamlandı\n");. This is the skeleton of real CLI tools: take arguments, process, print, return an exit code. Because the command count is fixed the output is always the same, making testing easy.

Exercise Write a command handler

Declare char *cmds[] = {"yardım", "çalıştır", "çık"}; and int n = 3;. Loop with for (int i = 0; i < n; i++) and print each command with printf("Komut: %s\n", cmds[i]);. After the loop print printf("Tamamlandı\n");.

Show example solution

#include <stdio.h>

int main(void) {
    char *cmds[] = {"yardım", "çalıştır", "çık"};
    int n = 3;
    for (int i = 0; i < n; i++) {
        printf("Komut: %s\n", cmds[i]);
    }
    printf("Tamamlandı\n");
    return 0;
}

Summary

In this group you learned command-line arguments in depth. You saw taking input with argc and argv, looping over them, parsing options with getopt, argument validation, and exit codes with exit.

You combined these to write a command handler skeleton. Real CLI tools follow the same flow: take, parse, validate, process, print, exit. In the next groups these foundations will be used on debugging and bitwise operations. Command-line skill is essential in systems programming; every tool eventually offers a CLI.

Test yourself

In what order does a CLI tool skeleton run?
- Print, take, process, exit
- Exit, take, process, print
- Take, process, print, exit
- Process, exit, take, print
Show answer

Take, process, print, exit — A CLI tool takes arguments, processes, prints, then exits.
Match concepts to use

argc/argv

Taking arguments
getopt

Option parsing
exit

Exit code
printf

Printing results

Next lesson: gdb basics

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