Linux RAM Usage: How to Use the 'free' Command

Understanding the 'free' Command

• 💡 The free command in Linux is used to check RAM and memory usage directly from the terminal.
• 📌 When run without options, it displays memory in hard-to-read numbers, showing columns for total, used, free, shared, buff/cache, and available memory.

Human-Readable Output

• 📊 To make the output easier to understand, use the -h option for human-readable units (e.g., GB).
• 📈 For specific units, you can use -g for gigabytes or -m for megabytes.
• ⚠️ Be aware that using -g can result in rounded numbers, potentially showing zero for very small values.

Real-Time Memory Monitoring

• ⚡ The free command can be used to monitor memory usage in real time by specifying a refresh interval.
• ⏱️ For example, free -g 2 will refresh the output every two seconds, showing dynamic changes in RAM usage.
• 💻 Opening applications like a web browser will visibly increase RAM usage and decrease free memory, which can be observed with the real-time view.
• 🛑 To stop the live monitoring, press Ctrl + C on your keyboard.