Why Mastering the Command Line Supercharges Your Productivity

1. Is the command line really good?

The command-line interface (CLI) was the dominant user interface before graphical user interfaces became widespread; it relies on keyboard input rather than a mouse. Skilled use of the CLI is often overlooked but can significantly increase an engineer's flexibility and productivity.

"Proficient command-line usage is a skill that many consider difficult, yet it enhances flexibility and productivity for engineers."

Personal opinion: debating the merits is less useful than simply trying it—if you find it helpful, learn it; if not, skip it. The value of any tool depends on the context, and the command line can be a powerful ally when used appropriately.

2. Feel the efficiency

Experimenting with the CLI quickly reveals its speed advantages over graphical menus.

3. Basic command line

Fundamental commands allow direct interaction with the operating system, enabling tasks that would otherwise require multiple clicks.

4. Things you should also know (examples)

Various common commands and workflows are illustrated in the accompanying images.

5. The amazing top command

The top utility is a widely used Linux system monitor that dynamically displays process information, including PID, memory usage, and CPU load, refreshing every five seconds.

Run it with: $ top The output consists of several lines:

First line: current time, system uptime, number of logged‑in users, and load averages for the past 1, 5, and 15 minutes.

Second line: total tasks, how many are running, sleeping, stopped, or zombie.

Third line: CPU usage percentages for user space, system space, nice processes, idle, I/O wait, hardware interrupts, and software interrupts.

Fourth line: memory statistics – total, used, free, and buffered/cache memory.

Fifth line: swap usage – total, used, free, and available memory.

Subsequent lines: per‑process details such as PID, USER, PR, NI, VIRT, RES, SHR, S (state), %CPU, %MEM, TIME+, and COMMAND.