英文:
Create a user prompt that does not write to stdout
问题
在bash中，有一个名为read的内置命令，它有一个-p选项。例如：
read -p "请输入一个值：" value
echo "${value}"
如果像这样执行该文件$ ./bashfile > result.txt
你将得到一个包含$value\n而不是请输入一个值：$value\n的文件。
在Go语言中，你可以做类似的事情。下面是一段代码：
fmt.Print("请输入一个值：")
reader := bufio.NewReader(os.Stdin)
value, _ := reader.ReadString('\n')
fmt.Println(value)
如果你使用$ ./goexecutable > result.txt运行它
result.txt的内容将会是请输入一个值：value\n。
在Go语言中是否有类似于bash中read -p的<PROMPT>字符串，它可以在命令行中打印，但不会输出到标准输出(stdout)？
英文:
In bash, there is a builtin called read which has the -p switch. For example:
read -p "Please enter a value: " value
echo "${value}"
If this file is then executed like $ ./bashfile > result.txt
You will end up with a file containing $value\n, but NOT Please enter a value: $value\n
In go, you can do something similar. Here's a section of code:
fmt.Print("Please enter a value: ")
reader := bufio.NewReader(os.Stdin)
value, _ := reader.ReadString('\n')
fmt.Println(value)
If you were to run that with $ ./goexecutable > result.txt
The content of result.txt will look like Please enter a value: value\n
Is there an equivalent in go to the bash <PROMPT> string from read -p which prints to the command line, but not to stdout?
答案1
得分: 6
Bash的read -p只是将提示打印到stderr。你可以通过将脚本的stderr重定向到/dev/null，然后注意到没有提示打印出来来进行判断。
./bashfile > result.txt 2> /dev/null
在Go语言中，你可以使用fmt.Fprintf来实现相同的效果。
fmt.Fprintf(os.Stderr, "请输入一个值：")
英文:
Bash's read -p just prints the prompt to stderr. You can tell by redirecting the stderr of your script to /dev/null and noticing that no prompt prints.
./bashfile > result.txt 2> /dev/null
You can do the same in Go using fmt.Fprintf.
fmt.Fprintf(os.Stderr, "Please enter a value: ")
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