#!/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[@]})
####### #######
done
echo "Choice student: ${choice[@]}"
原文：http://blog.51cto.com/sonlich/2068867