[user02@FC4 Lesson04]$ cat -n cerr.cpp

   1  #include <iostream>
   2  using namespace std;
   3
   4  int main()
   5  {
   6     cerr << "This Message Always Appears" << endl;
   7
   8     return 0;
   9  }

[user02@FC4 Lesson04]$ g++ -o cerr cerr.cpp
[user02@FC4 Lesson04]$ ./cerr
This Message Always Appears
[user02@FC4 Lesson04]$ ./cerr > test.txt
This Message Always Appears
[user02@FC4 Lesson04]$ ./cerr 2> cerr.txt
[user02@FC4 Lesson04]$ cat cerr.txt
This Message Always Appears