If you will be the SAS administrator on a UNIX platform, you need to learn the basics of the UNIX system as such, and the specifics of your UNIX brand (AIX, Solaris, HP-UX or one of the Linux distributions)
Knowledge of the basic commands present in UNIX like find, grep, sort, etc is also mandatory, and at least one course on bash shell scripting.
If you don't have proper UNIX admins in your organization, also do a course in UNIX administration for your UNIX brand.
If you're good at learning from manuals, you may be able to acquire the necessary knowledge on your own while working on the job.
And the respective forums like this here and stackoverflow can be very helpful for this, and GIYF will be true also.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.
Learn how to install the SAS Viya CLI and a few commands you may find useful in this video by SAS’ Darrell Barton.
Find more tutorials on the SAS Users YouTube channel.