how to avoid getting ^M in file? [closed] - vim

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I don't know why it appears in my file when using vim.
Sometimes not in the vim, but in the output of 'git diff', why?
what command can help me check if file under some dir have '^M' problem, and fix all of them?

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I want to make a calculator here, but here are the instructions if It doesn't work, what should I do? [closed]

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(https://i.stack.imgur.com/XnvNa.jpg)
I want to make a calculator here, but here are the instructions if It doesn't work, what should I do?

What is ` ${CMAKE_PLATFORM_SPECIFIC[#]} `? [closed]

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I am not very good at CMake and would like to know what the following flag below means.
"${CMAKE_PLATFORM_SPECIFIC[#]}"
Can someone please tell me what this means?
CMAKE_PLATFORM_SPECIFIC is an array.
"${CMAKE_PLATFORM_SPECIFIC[#]}" are all the elements of CMAKE_PLATFORM_SPECIFIC

Using Behave I want to run all my feature files but it throws error No steps directory but the same runs through pycharm [closed]

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When I use this command to run behave /ios_integration/features I get the ConfigError: no Steps directory
[
I believe the correct command would be:
behave ios_integration/features
(no preceeding slash)

I am not able to access this filename [{"filename":"54526108_1946746692102415_4003062236024143872_n.jpg"}] [closed]

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I have tried console.log(filename.filename); but it is not working.
[{"filename":"54526108_1946746692102415_4003062236024143872_n.jpg"}]
It’s an array with an object in it. Just try
console.log(filename[0].filename)

How to write in terminal commands previously used? [closed]

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As simple as that. My programming teacher do it and I want to know how to do it.
Thanks!
You just need to press up/down key.
Here you have a terminal guide for beginners.
Have a good day!

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