CODEWITHSUNDEEP
c++clinuxtext-files
Vincent Russo
Vincent Russo

Reputation: 1089

Removing ^M From File Generated on Linux

Alright, I'm attempting to remove these pesky ^M characters that pop up when I compile and run my program on Linux.

I've attempted running 

dos2unix filename

on the file, and the ^M's remain. I've also made sure that anytime I am opening the file, I am opening with 

ios::binary

Is there some way to remove the M's? Even a system call would work that I could call within my code would be fine as well, something like

std::system("Remove M's Command");

Any feedback would be most appreciated.

Thanks.

Upvotes: 1

Views: 3500

Answers (3)

Robᵩ
Robᵩ

Reputation: 168726

If your C++ program is already structured like this:

std::string str;
std::ifstream inputFile("file.txt", ios::binary);
while (std::getline(inputFile, str)) {
  // parse str and operate on the results
}

Then you can easily change it to:

std::string str;
std::ifstream inputFile("file.txt", ios::binary);
while(std::getline(inputFile, str)) {
  str.erase(std::remove(str.begin(), str.end(), '\r'), str.end());
  // parse str and operate on the results.
}

Upvotes: 1

ugoren
ugoren

Reputation: 16441

I'm not sure what ios::binary is, but it seems to me like the key.
It sounds related to Apple systems, and they use the CR (^M) character instead of LF (while Windows uses both). So if you have only CR, not CR-LF, then dos2unix won't work.

So why not just remove ios::binary (as @Joachim-Isaksson suggested)?

Upvotes: -1

Wes Hardaker
Wes Hardaker

Reputation: 22262

A number of tools will do it with a regular expression. For example, perl can edit the file in place:

# perl -i -p -e 's/\r//g' FILENAME

Upvotes: 6

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