First of all, there is a big difference between ksh88 and ksh94. The latter is closer to
bash, but it's ancient software. bash is clearly more advanced. ksh is retro
computing.
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I get the historical interest, but in today's world, is there any
advantage to ksh over bash? I get that lots of scripts are run
with /bin/sh and it is nice when that is fast, but aren't the cpus
fast enough these days that it sort of doesn't matter?