如何在 Makefile 中使用 sed
我尝试将以下内容放入我的 Makefile 中：
@if [ $(DEMO) -eq 0 ]; then \
cat sys.conf | sed -e "s#^public_demo[\s=].*$#public_demo=0#" >sys.conf.temp; \
else \
cat sys.conf | sed -e "s#^public_demo[\s=].*$#public_demo=1#" >sys.conf.temp; \
fi
但是当我运行 make 时，出现以下错误：
sed: -e expression #1, char 30: unterminated `s' command
如果我在控制台中运行包含 sed 的确切行，它们行为正确。
为什么我会收到此错误以及如何解决该问题？
I have tried putting the following in my Makefile:
@if [ $(DEMO) -eq 0 ]; then \
cat sys.conf | sed -e "s#^public_demo[\s=].*$#public_demo=0#" >sys.conf.temp; \
else \
cat sys.conf | sed -e "s#^public_demo[\s=].*$#public_demo=1#" >sys.conf.temp; \
fi
but when I run make, I get the following error:
sed: -e expression #1, char 30: unterminated `s' command
If I run the exact lines that contain sed in the console, they behave correctly.
Why am I getting this error and how can the problem be fixed?
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我尝试了双
$$符号，但它对我的问题不起作用，可能是$$$$或$$$$$$$$会起作用，因为我的 Makefile 调用其他 Makefile 等等。但我找到了更好的解决方案：在执行
sed命令的 Makefile 所在的同一文件夹中创建一个 shell 文件replacer.sh。给它可执行位现在你可以在你的 Makefile 中调用这个文件：
I tried double
$$sign but it didn't work in my problem, maybe$$$$or$$$$$$$$would have worked, because my Makefile calls other Makefiles and so on. But I found a better solution:Create a shell file
replacer.shin the same folder as your Makefile that executes thesedcommand. Give it executable bit withNow you can call this file in your Makefile:
当前的答案没有解决我在 makefile 中使用 sed 时遇到的一个问题，所以我将在这里解释一下。我像这样填充 Bash 变量：
remote_owner=$$($(MAKE) remote.owner)，然后在我的 sed 替换中使用这些变量。问题是，由于我的规则设置方式复杂，remote_owner可能有 make 自己的输出，给我错误：例如，通过添加调试消息，我发现 local_owner 设置为
：答案是添加
--silent选项来 make：remote_owner=$$($(MAKE) --silent remote.owner)one problem I had with using sed in a makefile isn't addressed by the current answers, so I'll explain it here. I was populating Bash variables like so:
remote_owner=$$($(MAKE) remote.owner)and then using those variables in my sed substitution. problem is, due to the convoluted way my rules are set up,remote_ownercould have make's own output in it, giving me the error:for example, by adding debugging messages, I found local_owner set to:
the answer was to add the
--silentoption to make:remote_owner=$$($(MAKE) --silent remote.owner)使用
#之外的其他内容来分隔各部分。Use something else than
#to separate parts.我机器中的
make版本是：而
sed版本：我必须为
$添加反斜杠，以防止 sed 将其视为行尾：The
makeversion in my machine is:And the
sedversion:I must add backslash for
$to prevent sed taking it as end of line:我建议您使用单引号而不是双引号，在运行 sed 之前，
$可能会被 make 处理为特殊字符：I suggest you use single quotes instead of double quotes, the
$might be processed as a special char by make before running sed:TL;DR：使用单引号并使用两个$符号。该表达式被扩展两次，一次由
make扩展，一次由bash扩展。这个答案的其余部分提供了进一步的上下文。可能是替换中的 $ 符号被 make 解释为变量。尝试使用其中两个，例如 .*$$#public_demo。然后 make 会将其扩展为单个 $。
编辑：这只是答案的一半。正如 cristis 回答的那样：另一部分是需要使用单引号来防止 bash 也扩展 $ 符号。
TL;DR: Use single quotes and use two $ signs. The expression is expanded twice, once by
makeand once bybash. The rest of this answer provides further context.It might be the $ sign in the substitution that is interpreted by make as a variable. Try using two of them like .*$$#public_demo. Then make will expand that to a single $.
EDIT: This was only half the answer. As cristis answered: the other part is that one needs to use single quotes to prevent bash from expanding the $ sign too.