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Re: `read -d x` hangs when run under gnu parallel, even if input is redirected

X-seq: zsh-users 30400
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: russ@xxxxxx
Cc: zsh-users@xxxxxxx
Subject: Re: `read -d x` hangs when run under gnu parallel, even if input is redirected
Date: Wed, 3 Dec 2025 09:49:21 -0800
Archived-at: <https://zsh.org/users/30400>
In-reply-to: <CA+zrezQe4G8X5fUb_vc5yAm1q19Y-7Sh+OL7sHxuB_4tYhvcMQ@mail.gmail.com>
List-id: <zsh-users.zsh.org>
References: <CA+zrezQe4G8X5fUb_vc5yAm1q19Y-7Sh+OL7sHxuB_4tYhvcMQ@mail.gmail.com>

On Tue, Dec 2, 2025 at 6:16 AM Russell Harmon <russ@xxxxxx> wrote:
>
> $ parallel -qu -- zsh -fc 'read -d x </dev/random' ::: a
>
> However the above hangs forever.

Add -u 0 to force reading stdin without considering it to be a terminal?

References:
- `read -d x` hangs when run under gnu parallel, even if input is redirected
  - From: Russell Harmon

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