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it works for some commands for example pwd, ifconfig, netstat, etc; but it does not get some answers such as "No such file or directory" when I used "gcc nonExistent.c" or "route help".
Any ideas?

thanks for answering

Instead of what?
I do not create or open a file. All I need is to get the answer of any command from the command line into a string, "pwd" is just an example.

Can you please give a simple...

How do I get the answer of a system call that is printed in the terminal?

for example:

I execute system("pwd");
and get the answer /home/user/

But because I need to send this result to...