Check free Memory in Linux using free command
Check free Memory in Linux using free command #devops #linuxscripting #coding #programming #linuxcommandlinetutorial
In this video, you’ll learn how to check free and used memory in Linux using the free command — one of the most essential tools for every DevOps engineer, Linux administrator, or programmer. 🧠💻
The free command displays your system’s memory usage, including total RAM, used memory, free memory, shared memory, buffer/cache, and available memory.
With a simple option like -h, you can make the output more human-readable and easier to understand.
💡 What You’ll Learn:
How to use the free command in Linux
Understand total, used, and available memory
Check swap space usage
Use human-readable format (-h option)
Practical tips for monitoring system performance
🧩 Examples Covered in the Video:
✅ Basic Command:
free
Shows total, used, and free memory in KB.
✅ Human-readable Output:
free -h
Displays memory usage in MB/GB format — much easier to read.
✅ Continuous Monitoring:
watch -n 1 free -h
Updates memory usage every second for real-time monitoring.
⚙️ Why It’s Important:
Monitoring memory usage helps you:
Detect performance bottlenecks
Optimize your applications
Troubleshoot high memory consumption
Manage server resources efficiently
Whether you’re working on Linux system administration, DevOps, or shell scripting, mastering the free command is a must-have skill.
🔗 Related Linux Commands:
Check CPU Usage → top or htop
Check Disk Space → df -h
Check Running Processes → ps aux
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