[t43562]

If I have bash and vim, find, less and grep I'm 90% good. If ripgrep and fdfind are installed I'm very happy.

One usually doesn't have to fall back from these too often because so many machines have them and its the fallback that I find so tiresome - having to get some other muscle memory going for a tool I haven't used in a while.

Level 2 would be strace - because it's so incredibly useful when trying to find out why something isn't working as you might expect.

I don't claim to be highly productive though - just old. Productivity for me comes from making up my mind what to do and being able to visualise it. Usually there's a massive period of unproductivity before every brief bit of decent work. If I was more decisive then people might know my name :-) but I'm obscure like most of us I presume.