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#!/bin/bash#students=(Lilei Hanmeimei Lucy Lily Tom Jerry John Polly UncleWang)# ---------------------- premise ----------------------------[ $# -eq 1 ] || exit[[ "$1" =~ [1-9] ]] || exit[ $1 -ge 1 -a $1 -le 9 ] || exit# ---------------------- Cycle $1 times --------------------for ((i=1;i<=$1;i++)); do total=${#students[@]} rand=$(expr $RANDOM % $total) choice[${#choice[@]}]=${students[$rand]} unset students[$rand]=${students[$rand]} # --- exclude array student pace ---- # unset unspace for j in ${students[@]}; do [ -z "$j" ] && countinue unspace[${#unspace[@]}]=$j done students=(${unspace[@]}) ####### #######doneecho "Choice student: ${choice[@]}"