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From: Michael Forney <mforney@mforney.org>
Date: Sat, 1 Jan 2022 18:34:25 -0800
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Subject: Re: [9front] [PATCH] g: use xargs instead of finding complete file
 list before greping
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On 2022-01-01, =E6=9C=89=E6=BE=A4 =E5=81=A5=E6=B2=BB <karisawa@gmail.com> w=
rote:
> Experiment in my server is
>
> hebe% a=3D`{seq 1 4000}
> hebe% echo $a
> 1 2 3 4 [snip] 3997 3998 3999 4000
> hebe%
>
> hebe% ls -l /sys/src/cmd/rc/io.c
> --rw-rw-r-- M 98029 sys sys 3757 Oct  5  2019 /sys/src/cmd/rc/io.c
> hebe%

Looks like you're using an rc from before the recent refactoring on
2021-12-31 (commit b90036a0, rc: fix everything).

Before the refactor, the write errors to /env/a were silently ignored.
The rc process that initially set the `a` variable *does* keep track
of the entire list, it is only when it goes to update /env/a that it
gets truncated.

You can try:

a=3D`{seq 1 4000}
rc -c 'echo $#a'

This should show that the list is truncated in both versions of rc.
It's just that the new version writes out the message 'Write error'
when this happens.