Yes, I was a bit confused about this too. Bash (1989) itself is a modern Linux tool. The Unix classic (released between 1973 and 1985 according to the author) w

Yes, I was a bit confused about this too. Bash (1989) itself is a modern Linux tool. The Unix classic (released between 1973 and 1985 according to the author) would be sh (1979) or perhaps ksh (1983).