# Towers of Hanoi in bash## cribbed from the ksh93 book, example from exercises on page 85## Chet Ramey# chet@po.cwru.eduhanoi() # n from to spare{    typeset -i nm1=$1-1    ((nm1>0)) && hanoi $nm1 $2 $4 $3    echo "Move disc $2 to $3"    ((nm1>0)) && hanoi $nm1 $4 $3 $2}case $1 in[1-9])      hanoi $1 1 2 3;;*)    echo "${0##*/}: Argument must be from 1 to 9"      exit 1;;esac