英文:
Convert varible to number for dd command using Shell script
问题
我可以帮你将这段内容翻译成中文：
我使用Shell脚本解析了/proc/PID/maps，现在我有两个变量：
START_ADDR=982fe000
END_ADDR=984fe000
我想要在Shell脚本命令中使用这些变量来执行dd，类似于以下命令：
dd if=SOME_MEMORY skip=START_ADDR count=(END_ADDR-START_ADDR) of=out.bin bs=1
请问如何将这些变量转换为dd命令中可用的形式？
英文:
I parsed /proc/PID/maps using shell script , now I have 2 variable
START_ADDR=982fe000
END_ADDR=984fe000
I want to use those variable for dd using shell script command like:
dd if=SOME_MEMORY skip=START_ADDR count=(END_ADDR-START_ADDR) of=out.bin bs=1
How can I convert those variable for dd?
答案1
得分: 2
由于您没有提到您使用哪个shell，我假设您正在使用bash。
请记住，您可以根据以下方式修改您的上述命令以使其正常工作。
dd if=$SOME_MEMORY skip=$START_ADDR count=$((0x$END_ADDR - 0x$START_ADDR)) of=out.bin bs=1
您需要确保变量SOME_MEMORY、END_ADDR和START_ADDR在当前shell环境中是可访问和存在的，您可以验证这一点，执行以下命令：
echo $SOME_MEMORY、echo $START_ADDR以及类似地echo $END_ADDR
英文:
As you didn't mention which shell you are using, I am assuming you are using bash.
Keeping that in mind, you can modify your above command as shown below to make it work.
dd if=$SOME_MEMORY skip=$START_ADDR count=$((0x$END_ADDR - 0x$START_ADDR)) of=out.bin bs=1
You need to make sure the variables SOME_MEMORY, END_ADDR and START_ADDR are accessible and present in current shell environment, to verify you can do
echo $SOME_MEMORY, echo $START_ADDR and similarly echo $END_ADDR
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