Hello everyone, I am using centos,
1) solaris is free right?
2) I want to learn solaris and install it in a computer that I am mounting, I would like know what is strong in solaris and if do it is wise. I am programmer python, learning machine and programming in general,..any help thanks,..
You are asking in the wrong forum, there is one dedicated to Solaris questions.
About 1), that depends on your definition of free. The kernel and many parts of Oracle Solaris are proprietary, other are open source. You can download, install and use Oracle Solaris for free (but without support and upgrade) if you comply with the OTN license requirements.
There are also OSes based on Illumos (OpenSolaris fork).
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It depends on exactly what you are trying to learn.
CentOS is a very good Linux distribution. Linux is generally open source and support by a vast user community.
Solaris on the other hand is Unix, owned by Oracle and is a big boys operating system, commercially supported, and well capable of running a big financial institution such as a bank. You wouldn't run an operating system in a bank without full commercial support services (unless you are mad).
Learning Solaris, HP-UX, AIX and the like is certainly professional stuff which cannot do you any harm at all.
I worked most of my professional career as an AIX admin for banks (they seem to just love IBM) and i can tell you that they use Linux in abundance. For instance, my last client (one of the biggest german banks) had ~400 AIX systems, some few Solaris and HP-UX systems (together maybe a dozen) and ~1000 Linux systems (mostly SLES) in their data centre.
For SAP HANA you are even forcced to use Linux (IIRC RHEL, SLES or Ubuntu), because even on IBMs pSeries it doesn't run on anything else.
I wouldn't invest any time in learning HP-UX because i think it is dying a slow death (mostly because HP abandoned it after Intels plan to discontinue the Itanium), but other commercial UNIXes (that means mostly AIX and Solaris) are still going strong and it seems reasonable to learn them.
As of the threads title: the question IMHO is not so much "what is good" but "what will survuve on the market". I.e. with video, Betamax was good but VHS survived. If you invested money in the worse but surviving techology VHS you were better off in the long run, sad to say.
I hope this helps.
bakunin
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@Bakunin......So did this bank run SLES without a paid support contract?
Yes, of course. "SLES" is for "SuSE Linux Enterprise System" - basically SuSE with less options but with a high price so that big business can "buy" the good.
They have i.e. from SLES 11 to SLES 12 dropped the real ksh93 from their repository and now have some "pdksh" under the name of "ksh" (which you only find out if you are willing to follow a symlink pointing to a symlink pointing to a.... - and of course by seeing your ksh scripts fail) and they also dropped ext4 and ext2 and ext in favour of ext3 without announcement (try updating a system from SLES 11 to SLES 12 and half of your filesystems might be missing without notice) - but, hey, they are charging a lot of money for that, so it must be good, no?
Sorry for some traces of sarcasm in my diatribe its a leftover from applying "common sense" (actually not part of ITIL) to systems administration.
bakunin
Dropping ext2 AND ext4? ...Ngh. I sense competing priorities. "We must be modern! ext2 is depreciated!" "We must be reliable! ext4 is newfangled!"
...which cuts out the old things you need to support and the new stuff that's badly needed.