Re: How to force delay in command execution in unamed pipe?

[Jesse Hathaway]

On Sun, Apr 3, 2022 at 12:11 AM Peng Yu <pengyu.ut@gmail.com> wrote:
> cmd <(cmd1) <(cmd2)
>
> For a command like the above, I will need to let cmd2 run after cmd1
> finishes. Of course, one could use temp files like the following. But
> is there a way to follow such a constraint with unnamed pipes?

Peng, could you use a named pipe to synchronize?

e.g.

#!/bin/bash

sync_fifo='/tmp/sync_fifo'
mkfifo "$sync_fifo"
cat <(
    date +1-%s
    sleep 1
    echo COMPLETE >>"$sync_fifo"
) <(
    read -r _ <"$sync_fifo"
    date +2-%s
)

rm "$sync_fifo"