One of the principal things that "got done" using Bash (at least until 2017 -- after that, I couldn't say) off the top of my head was the GFS at NCEP. Yes, it was predominantly Fortran for number crunching; but what tied all the individual programs together was a super massive, maintained, and constantly modified and improved Bash script. And yes, there were plans in the works to switch out for something else (which is why I cannot say, four years later, what the status quo is). I should also mention, it was this Bash script that ran parallelized on the supercomputer -- and it was ultimately this script which, every three hours, produced the next set of forecasts, 24/7.