是否可以将打印到终端的所有内容记录到C中的文本文件中？

Question

I have a ton of printf statements and I would like to write all of them to a text file. I realize I could just add fprintf statements after each one but is there a better way, such as a function, or should I just write my own function? I feel like this is probably a standard procedure, I just don't know what it's called, so it's hard to find an answer by googling.

EDIT: Just for clarity, I'd like the output to keep going the terminal like normal, but also be printed to a file simultaneously. Several people are suggesting bash commands. When should those be executed? After the program is run?

Answer 1

If you're on a UNIX type box, you can pipe the output through tee , which will deliver it to standard output and a file:

myProg | tee /tmp/myProg.out

There are also ways to do the same thing with standard error as well:

( myProg 2>&1) | tee /tmp/myProg.out_and_err

This of course depends on whatever shell you're using but that should work on the most common ones.

Answer 2

When the program is run, use the > bash operator to redirect the programs output to a text file:

IE

myprogram > myfile.txt

That will save everything normally outputted to the screen with printf to a file named myfile.txt.

Answer 3

How about to redirect the stdout to a file, like

int main ()
{
  freopen ("myfile.txt","w",stdout);
  printf ("This sentence is redirected to a file.");
  fclose (stdout);
  return 0;
}

code sample comes from c++ Reference for freopen

Answer 4

You can do: ./executable > outputfile 2>&1 or ./executable &> outputfile

This will enable you to redirect both the standard output and the standard output to the outputfile .