shell編程中的select用法

select 語句

select表達式是bash的一種擴展應用，擅長於交互式場合。用戶可以從一組不同的值中進行選擇：

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

下面是一個簡單的示例：

#!/bin/bash

echo "What is your favourite OS?"
select var in "Linux" "Gnu Hurd" "Free BSD" "Other"; do
  break;
done
echo "You have selected $var"

該腳本的運行結果如下：

What is your favourite OS?
1) Linux
2) Gnu Hurd
3) Free BSD
4) Other
#? 1
You have selected Linux

-------------------------------------------------------------------------------------------------

運行時出現：

select.sh: 3: select: not found

select.sh: 5: Syntax error: "done" unexpected

把#!/bin/sh改為#!/bin/bash

執行腳本時將sh select.sh改為 bash select.sh