If you learn purely Unix, then how easy is it to switch to Linux later?

Ivan2020-09-17 14:22:33

linux

Ivan, 2020-09-17 14:22:33

Of course, I heard that Unix is already dead, but sometimes it slips into vacancies and the question is, how much do Unix and Linux differ in your experience and if you learn one of them, then how much will the difference be if you switch to another?
PS I'm interested in the personal opinions of people who have used both of these systems (and not just one, otherwise how can you answer my question?). Yes, everywhere is different, everyone has different requirements and views, different technologies, so I want to know the views of different people.

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8 answer(s)

res2001, 2020-09-17
@ivan_minin

On what you are going to learn "pure Unix"? By books? By standards?
Now, as such, UNIX does not exist. The UNIX trademark is owned by The Open Group.
Officially, the OS can be called UNIX if it receives a certificate from The Open Group. The certificate is issued after passing tests for compliance with the Single UNIX Specification.
Here is a list of all certified UNIXs: https://www.opengroup.org/openbrand/register/
Although Linux has not been certified, it complies with the standard. Therefore, we can consider that Linux is one of the implementations of UNIX. Therefore, do not worry and learn Linux. In the vast majority of vacancies, UNIX is understood as Linux.
And further. Even certified UNIXs differ from each other in much the same way that Linux differs from FreeBSD.
Good luck!

Dr. Bacon, 2020-09-17
@bacon

What is the problem? It doesn't matter to me what to learn from it. It doesn’t even need study, but an understanding of the basics of OS. Everything else is reading manuals.

Vladimir Kuts, 2020-09-17
@fox_12

Worked (administered) MacOS, OpenBSD, FreeBSD, Red Hat, CentOS, Debian, Ubuntu, Raspbian, and a number of unix-like operating systems - the basic functionality + is the same, and switching from one distribution kit to another did not cause any particular difficulties .

Vitaly Karasik, 2020-09-17
@vitaly_il1

The answer is easy, I did it myself in the mid-late 90s.

CityCat4, 2020-09-17
@CityCat4

Easy enough. So I went through the "combat path": SCO Unix -> BSDi -> FreeBSD -> Linux (I will not list distributions). The general organization is the same, the principle of building the system is the same, the method of launching programs and package management is different. And from the point of view of Apache, let's say in general deeply in parallel - the file layout points change, but the configs can easily be dragged between systems - unless of course you understand what is written there :)

Saboteur, 2020-09-17
@saboteur_kiev

In general, Unix and Linux are very similar.
Both POSIX. They have the same ideology, many commands - the same GNU set.
The core is of course different, some individual things are different.
But at that moment, when a person can immediately name at least 10-20 signs of how Unix differs from Linux, he will not ask questions like yours.

paran0id, 2020-09-17
@paran0id

Most likely, it slips as a generalization of modern Unix-like systems, with a rare exception. learn linux.
PS admin freebsd, linux debian and redhat, windows.

Alexey Cheremisin, 2020-09-17
@leahch

Yes, they are different, and significantly. And what "Unix" are you going to learn, and what "Linux"? Of the living Unixes, only three BSDs remain: FreeBSD (and its variants), MacOS (yes, this is the same Apple!), Well, and unforgettable Minix. I do not take into account any RTOS like QNX - a separate clearing.
They differ in a set of utilities (although you can install GNU versions everywhere), management, behavior, settings.
Yes, and Linux distributions are sometimes very different, if you look biased - Debian and CentOS for example.
And what does it mean to learn? You will have to learn not a specific distribution, but specific software, since it is now almost the same for everyone. The problem is different - there are several diametrically opposed implementations of the same service - take Nginx and HaProxy, bind and PowerDNS, KDE and Gnome ....
Unix (like Linux) is good because there is plenty to choose from!
And if you teach, then learn the basics of building operating systems, and, of course, learn Linux - and other systems are built on similar principles.
If you learn to ride a bicycle, then you will ride a scooter and a scooter - the principle of movement is the same. But they are very different!