How to add .p12 certificates to Ubuntu 18.04.2 LTS (GNU/Linux 4.15.0-50-generic x86_64) server?

Question

Command line

Good day. I need to send certificate files to the server to sign IOS applications. with extensions .p12 for the certificate itself .txt for the certificate key and .MOBILEPROVISION. There the program will sign them.

But I am a complete teapot in communicating with the server through the command line, and googling the solution of one issue obliges me to master another functionality. It's kind of a vicious circle. How can something so simple be so complex?

Please give me some tips on how to do it easier or faster. How to interact with these certificates so that the server accepts them and allows the program to work with them?

Answer 1

Imagine that for the first time in your life you see a computer with a mouse.
How to copy a file? How to guess that it turns out that you can go to the folder (what is it?), how to guess that for this you need to move the cursor and press the left mouse button, and even twice, and even quickly. Yes, and several times until you go to the desired folder.
How to guess that the desired file needs to be dragged with the mouse (and even guess what it is with the left button), and even where to pull it? How to guess that you can open TWO folders on the desktop at once?
And the handles are crooked, unusual for a mouse, it doesn’t work to get into small icons right away, when you press the button, the mouse itself moves until you understand how to copy the file, during this time you will have time to move a couple of files or folders somewhere and you can’t even see the logs where and what moved.
As you can see, this simple action is actually very complex, you just learned it.
Also with the command line - this is not an outdated, but an actual way of interacting with a computer, which is actively used when working with remote servers.
The advice is simple - you take and master the work of the cd, ls, cp, mv, cat commands,
a couple of hours should be enough if you practice on some kind of virtual machine.

Answer 2

Nothing is clear - what needs to be done? The .p12 file is not really a file :) It is a special format archive containing three or more files - a certificate, a certificate key, and the certificate of the issuing CA. You can't even ask a question.
Certificates are not "simple" at all :)
The command line is also far from "simple". Although of course, there are many simple commands.