e: we have some part success: I tried the process again with running 'bash oneBash' in a 'main' screen configured ZCL as coin.
unfortunately the mining process still suffers but the wtm screen is running and after a while it recognized eth is the new coin to go and it switched the mining to eth/claymore inside the 'wtm' screen.
I will try to figure out now why zcl doesn't start. tyvm papampi

e2: ok, I googled this unary expression thing again and found https://stackoverflow.com/questions/13617843/unary-operator-expected

I changed the first lines that had this error for testing in oneBash:

to the following (There is no reason I did the first two: I started out and on 2nd extra quotation I realised I should have a try first so the first one might have been enough)

ZCL works again. However, because of these early stages of rxOC there was no screen session implemented for ZCL, only claymore I guess. therefore, a second mining instance starts parallel in wtm screen. I guess I need to add this in oneBash.
 
e3: hmm yeah, now I get double screen -r miner What to do? - answer: 'bash wtm_auto_switch' @ screen 'main' <- This does also open two miner screens/processes when starting out with ETH it just does one, but there is also a  message saying "now mining in screen -r miner" not sure if this message holds further bash lines from executing. I added screen -dmS miner to ZCL oneBash like this: