通过简单的交互脚本，体验不同操作系统的魅力，了解Linux、UNIX、Windows和其他选择的区别。
#! /bin/bash
echo "What is your favourite OS?"
select var in "Linux" "UNIX" "Windows" "Other";
do
echo "You have selected $var."
done
echo "What is your favourite OS?"
select var in "Linux" "UNIX" "Windows" "Other";
do
echo "You have selected $var."
done
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