# Building RentDB — A Small CLI-Based Rent Management System in C

ROSHAN MALLICK — Sat, 16 May 2026 15:02:11 +0000

Building RentDB — A Small CLI-Based Rent Management System in C

Recently, I started building small projects in C to better understand systems programming, file handling, and how command-line applications work.

One of those projects became RentDB, a simple CLI-based Rent Management System written in C.

The idea came from a real problem I was facing.

Every month I had to manually manage rent payment entries in spreadsheets. Entering records repeatedly, organizing payment details, and maintaining everything manually started becoming messy and time-consuming.

So instead of repeating the same process again and again, I decided to build a small terminal-based tool that could simplify the workflow.

What RentDB Does

RentDB is a lightweight command-line application that allows me to:

store rent records
manage tenant information
export records into CSV format
organize payment history
automatically sync exported files to Google Drive using rclone on Linux

The goal of the project was not to build something complex, but to create a practical tool that solves a real problem.

Why I Built It in C

I wanted to improve my understanding of:

file handling
modular programming
CLI application structure
Linux workflows
project organization

Working with C forces you to think carefully about program structure and data handling.

While building this project, I spent a lot of time debugging file operations, fixing export issues, and handling edge cases.

That process taught me much more than simply following tutorials.

Reusing Logic From Older Projects

One interesting part of this project was that I reused and improved logic from my previous C Student Database System project.

That earlier project helped me understand:

CRUD operations
modular code organization
file management
project structure

While working on RentDB, I started realizing how important code reuse and improvement are in software development.

Instead of starting every project from zero, I tried improving older ideas and applying what I had already learned.

Adding Google Drive Auto-Sync

One feature I enjoyed building was automatic Google Drive synchronization using rclone on Linux.

Whenever the CSV export is generated, the file can automatically sync to cloud storage.

While implementing this feature, I learned more about:

Linux filesystem permissions
path handling
automation workflows
integrating external tools

It also made the project feel more practical.

Problems I Faced

While building RentDB, I faced several issues:

file handling bugs
export path problems
Linux permission issues
CSV formatting problems
unexpected runtime errors
debugging cloud sync commands

Some small mistakes took hours to debug.

But solving those problems step-by-step helped me understand how important debugging and problem-solving are in programming.

What I Learned

This project helped me improve my understanding of:

modular C programming
Makefiles
CLI application design
Linux tools and workflows
debugging techniques
structured problem solving

More importantly, it showed me that programming becomes much more interesting when you build things that solve real problems around you.

Future Improvements

Some things I want to improve in future versions:

better error handling
improved CSV formatting
search and filtering support
SQLite integration
better terminal UI

Final Thoughts

I am still learning and still exploring systems programming.

Projects like RentDB are helping me understand how software works beyond just writing code.

Building small real-world tools has been one of the best learning experiences for me so far.

GitHub Repository

[https://github.com/Roshan-Mallick/RentDB]

I would appreciate any feedback or suggestions for improvement.

Thank you for reading.

cprogramming #linux #opensource #cli #systemsprogramming #github

DEV Community: ROSHAN MALLICK