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examples/scripts/hanoi.bash

 

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# Towers of Hanoi in bash

 

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#

 

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# cribbed from the ksh93 book, example from exercises on page 85

 

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#

 

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# Chet Ramey

 

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# chet@po.cwru.edu

 

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hanoi() # n from to spare

 

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{

 

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    typeset -i nm1=$1-1

 

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    ((nm1>0)) && hanoi $nm1 $2 $4 $3

 

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    echo "Move disc $2 to $3"

 

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    ((nm1>0)) && hanoi $nm1 $4 $3 $2

 

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}

 

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case $1 in

 

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[1-9])

 

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      hanoi $1 1 2 3;;

 

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*)    echo "${0##*/}: Argument must be from 1 to 9"

 

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      exit 1;;

 

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esac

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