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Q&A Capture separate _and_ combined stdout/stderr

Using BASH, how can I redirect stdout and stderr each, to two separate files, simultaneously? That's a mouthful, let me clarify a little: I have a hypothetical script that may/will generate outpu...

1 answer  ·  posted 2y ago by jaybeers‭  ·  last activity 2y ago by Quasímodo‭

Question shell bash
#1: Initial revision by user avatar jaybeers‭ · 2022-04-25T21:25:53Z (almost 2 years ago)
Capture separate _and_ combined stdout/stderr
Using BASH, how can I redirect stdout and stderr each, to two separate files, simultaneously?

That's a mouthful, let me clarify a little:

I have a hypothetical script that may/will generate output on both stdout and stderr.  I want to run the script and wind up with three output files:

1. The contents of stdout only (`>stdout.txt`).
2. The contents of stderr only (`2>stderr.txt`).
3. The combined contents of stdout and stderr, interleaved as they would have been had they been printed to the terminal in real time (`>both.txt 2>both.txt`).

With Zsh you can do something like this with `MULTIOS` enabled:

```
script.txt >stdout.txt >>both.txt 2>stderr.txt 2>>both.txt
```

...but I need something that'll work on systems that don't have Zsh installed.