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Multios redirection while keeping current descriptors, and exec

X-seq: zsh-users 27749
From: Zach Riggle <zachriggle@xxxxxxxxx>
To: Zsh Users <zsh-users@xxxxxxx>
Subject: Multios redirection while keeping current descriptors, and exec
Date: Tue, 10 May 2022 13:20:59 -0500
Archived-at: <https://zsh.org/users/27749>
List-id: <zsh-users.zsh.org>

Hello all!

Is there a simpler way to additionally log stdout/stderr to a file, while keeping the existing one?

{ echo stdout; >&2 echo stderr } > /tmp/log > /dev/tty 2> /tmp/err 2>/dev/tty

Will log stdout to stdout and /tmp/log, for example.

Specifically, I want to be able to do this for the remainder of the process via "exec". The goal is to have an interactive stdio like normal, but also log all stdout / stderr to a log file.

Zach Riggle

Follow-Ups:
- Re: Multios redirection while keeping current descriptors, and exec
  - From: Bart Schaefer
- Re: Multios redirection while keeping current descriptors, and exec
  - From: John Covici

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