shell编程中的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 ....
下面是一个简单的示例:
#!/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"
该脚本的运行结果如下:
What is your favourite OS? 1) Linux 2) Gnu Hurd 3) Free BSD 4) Other #? 1 You have selected Linux
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运行时出现:
select.sh: 3: select: not found
select.sh: 5: Syntax error: "done" unexpected
把#!/bin/sh改为#!/bin/bash
执行脚本时将sh select.sh改为 bash select.sh
千里之行,始于足下。改变现在,就是改变未来。改变未来,从现在开始。
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