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Comment by Hello71 | Hacker News Reader

unless you're exclusively running shell built-ins, doesn't running any command at all potentially cause a disk scan

Usually the shell creates a cache of commands on start, which can be refreshed with `hash -r`.

As far as I can tell the hash table is initially empty after you first start the shell. At least, that's the case for bash.

  $ hash
  hash: hash table empty