What is cli?
A CLI, or Command Line Interface, is a way to interact with a computer by typing text commands into a console or terminal window instead of clicking icons and menus with a mouse.
Let's break it down
- Command: a word or phrase that tells the computer to do something (e.g.,
copy,list,delete). - Line: you type one command per line, then press Enter to run it.
- Interface: the text screen where you type and see the computer’s responses. Think of it like sending a text message to your computer: you write a command, hit send, and the computer replies with the result.
Why does it matter?
- Speed: once you know the commands, you can do tasks much faster than navigating many clicks.
- Power: many advanced functions are only available through the CLI.
- Automation: you can write scripts (lists of commands) to repeat tasks automatically.
- Universality: the same commands often work on different operating systems, making it easier to work on many machines.
Where is it used?
- System administration (managing servers, installing software).
- Development (running build tools, version control like Git).
- Networking (checking connections, configuring routers).
- Data processing (searching files, manipulating text).
- Everyday tasks for power users on Windows, macOS, Linux, and even mobile devices with terminal apps.
Good things about it
- Low resource usage - it runs on almost any computer, even old ones.
- Precise control - you can specify exactly what you want the computer to do.
- Scriptability - you can combine commands into reusable scripts.
- Consistency - the same command works the same way every time, reducing accidental clicks.
Not-so-good things
- Steeper learning curve - you must remember commands and syntax.
- Less visual - no pictures or drag‑and‑drop, which can be intimidating for beginners.
- Error‑prone - a small typo can cause a command to fail or do something unintended.
- Limited discoverability - you don’t see all options at a glance like you do in graphical menus.