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Monadic ⎕SH means

Execute UNIX Command

       ⎕SH'ls'
FILES WS temp

Dyadic ⎕SH means

Start UNIX Auxiliary Processor

      )CLEAR
clear ws
      'xutils' ⎕SH 'xutils'
      )fns
avx     box     dbr     getenv  hex     ltom    ltov    mtol    ss      vtol

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