On 3/18/24 9:06 AM, Janis Papanagnou wrote:

On 18.03.2024 15:14, Arti F. Idiot wrote:

I think several OSes have a tool called 'progress' which sort of
functions as you've described; NetBSD does natively.

Oh, I wasn't aware that there's some OS specific standard for that.

Having it built-in would be better though. Was 'alarm' removed in
ksh93?

It was (still is) there in [official] ksh93u+. That was the version
I predominantly used on my platforms.

Meanwhile I've replaced the "u+" version by Martijn Dekker's "u+m"
version. (The latter has less bugs and works much more reliable.)
It's just my recent switch that made me notice that in his branch
there's no 'alarm' available any more.

Janis

I was mistaken; alarm is in the att-ksh93 pkgsrc package, it's just an undocumented built-in, apparently because D. Korn felt it it didn't
function consistently. My brief experiments earlier resulted in several
hung sessions. It's an interesting idea though.

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On 2024-03-18 10:14 a.m., Arti F. Idiot wrote:

I think several OSes have a tool called 'progress' which sort of
functions as you've described; NetBSD does natively. 

Careful, though. On Linux systems it is unlikely to be installed by
default. And even if it is installed, it's likely to be a very
different 'progress' program than the NetBSD one:

https://github.com/Xfennec/progress

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On Mon, 18 Mar 2024 12:39:51 -0700, Keith Thompson wrote:

Scheduled commands run only while the shell is waiting at a prompt for
input.

I wonder why shells don’t make use of poll(2) to run things asynchronously
to command input.

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