Re: [Help-bash] How to not terminate a process using pipe?

[Peng Yu]

> The echo will open and close the the file refered to by in and out.
> The close action will cause cat to quit.
>
> What you need to do is to keep the files open, like
>
> mkfifo in out
> exec 111<in 222>out
>
> echo x >&111
> read -r x <&222
>
> echo x >&111
> read -r x <&222
>
> # Close the file descriptors.
> exec 111<&- 222<&-

This does not seem to work as it hangs there.

/tmp$ cat main1.sh
#!/usr/bin/env bash
# vim: set noexpandtab tabstop=2:

tmpdir=$(mktemp -d)
mkfifo "$tmpdir"/infifo "$tmpdir"/outfifo
set -v
exec 111<"$tmpdir"/infifo 222>"$tmpdir"/outfifo

echo x >&111
read -r x <&222

echo x >&111
read -r x <&222

# Close the file descriptors.
exec 111<&- 222<&-

/tmp$ ./main1.sh
exec 111<"$tmpdir"/infifo 222>"$tmpdir"/outfifo


-- 
Regards,
Peng