select用法

select 语句

select表达式是bash的一种扩展应用，擅长于交互式场合。用户可以从一组不同的值中进行选择：

select var in ... ; do
　break;
done
.... now $var can be used ....

下面是select使用的例子：

1.

#!/bin/bash
##filename:what-lang-do-you-like_menu_select.sh 

clear
PS3="What is your preferred scripting language? "
select s in bash perl python ruby'(quit)'
do
        case $s in
                bash|perl|python|ruby)  echo "You selected $s ."  ;;
                '(quit)')               break ;;
                *)                      echo "You selected error,retry..."  ;;
        esac
done

2.

#!/bin/bash
##filename:what-lang-do-you-like_menu_select.sh 

clear
PS3="What is your preferred scripting language? "
select s in bash perl python ruby'(quit)'
do
        case $s in
                bash|perl|python|ruby)  echo "You selected $s ."  ;;
                '(quit)')               break ;;
                *)                      echo "You selected error,retry..."  ;;
        esac
done