Makefile - 为什么读取命令不读取用户输入？
我在 Makefile 中有以下代码：
# Root Path
echo "What is the root directory of your webserver? Eg. ~/Server/htdocs" ;
read root_path ;
echo $root_path ;
if [ ! -d $root_path ] ; then \
echo "Error: Could not find that location!" ; exit 1 ; \
fi
但是，当输入任何内容（例如“asd”）时，这就是返回的内容：
What is the root directory of your webserver? Eg. ~/Server/htdocs
asd
oot_path
Error: Could not find that location!
当我期望看到的是：
What is the root directory of your webserver? Eg. ~/Server/htdocs
asd
asd
Error: Could not find that location!
我该如何解决这个问题？？？
I have the following code inside a Makefile:
# Root Path
echo "What is the root directory of your webserver? Eg. ~/Server/htdocs" ;
read root_path ;
echo $root_path ;
if [ ! -d $root_path ] ; then \
echo "Error: Could not find that location!" ; exit 1 ; \
fi
However when typing anything (eg. "asd") this is what gets returned:
What is the root directory of your webserver? Eg. ~/Server/htdocs
asd
oot_path
Error: Could not find that location!
When what I would expect to see would be:
What is the root directory of your webserver? Eg. ~/Server/htdocs
asd
asd
Error: Could not find that location!
How do I fix this???
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评论（2）
直接的问题是 Make 本身对
$的解释与 shell 不同。尝试：双
$$对 Make 转义$，因此它将单个$传递到 shell。另请注意，您需要使用\行延续，以便整个序列作为一个 shell 脚本执行，否则 Make 将为每一行生成一个新 shell。这意味着您读取的任何内容都会在 shell 退出后立即消失。我还想说，一般来说，提示从 Makefile 进行交互式输入的情况并不常见。您最好使用命令行开关来指示 Web 服务器根目录。
The immediate problem is that Make itself interprets the
$differently than the shell does. Try:The double
$$escapes the$for Make, so it passes the single$through to the shell. Note also that you will need to use\line continuations so that the whole sequence is executed as one shell script, otherwise Make will spawn a new shell for each line. That means that anything youreadwill disappear as soon as its shell exits.I would also say that in general, prompting for interactive input from a Makefile is uncommon. You might be better off using a command line switch to indicate the web server root directory.
使用 .ONESHELL 使多行命令比使用 ';' 更容易阅读和 '\' 分隔行：
我没有足够的业力来发表评论，因此有一个答案（应该是对已接受答案的评论）：
Using .ONESHELL makes multiline commands easier to read then using ';' and '\' to separate lines:
I don't have enough karma to post comments, therefore an answer (which should've been a comment to the accepted answer):