Not lately, at a previous job we worked with Linuxes, Solaris, AIX, HP/UX and Linux on 390 mainframes. The reason I'm chiming in is to give my advice to those

Not lately, at a previous job we worked with Linuxes, Solaris, AIX, HP/UX and Linux on 390 mainframes. The reason I'm chiming in is to give my advice to those still dealing with these; learn vi, at least enough to edit config files. It's the only editor you can find on all of these, and you often can't install your own software.