Redirecting stdout from two programs I'm running a memory check tool (prog1) on a C++ code (prog2), both of which give me a huge and detailed output. In order to chase down some bugs I need to save this output to a file. I tried redirecting the stdout to a file: prog1 prog2 > outfile.txt But that gives me a file containing the output of prog2, while the output of prog1 is still going to the terminal. Anyone know a way to specify that I want BOTH outputs to go to a file? Like `(prog1 prog2) > outfile.txt`?

There’s a good chance that `prog1` is writing its output to standard error. You can redirect both outputs to a single file with


prog1 prog2 > outfile.txt 2>&1


or you can split the outputs with


prog1 prog2 > outfile.txt 2> errors.txt


This doesn’t separate the individual _programs_ ’ output, it separates the output channels. See What are the shell's control and redirection operators? for details.

If you look at `prog1`’s documentation, you might find an option to tell it to store its output in a named file instead. For example, with `strace`,


strace -o strace.txt prog2 > outfile.txt


would store `strace`’s output in `strace.txt`, and everything written to standard output in `outfile.txt`.