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I recall icheck, dcheck, and clri, and never had to use fsdb.

Also, mknod for populating entries in /dev, creating fifos, etc.

Luxury. You haven't lived until you had to use 'adb' to try and debugger a filesystem.

I think I was still doing this in the mid-90s?

I share your trepidation. I once had to use clri and such to clean up a mess and it was terrifying.

Oh yes. For one thing "hexdump -C ." would work out nicely in those days.

Isn't hexdump the modern punk upstart.

In my day we had to use od, and were happy to have it, now get off my lawn.

Full disclosure, I am one of those "modern punk kids" but my first boss was firmly in the od generation. and all his documentation referenced it as such. hexdump is ergonomic heaven in comparison.