Re: [ksh93u+m] alarm timer function

On 3/17/24 11:51 PM, Janis Papanagnou wrote:

On 17.03.2024 21:01, Kaz Kylheku wrote:

On 2024-03-17, Janis Papanagnou <janis_papanagnou+ng@hotmail.com> wrote:

The program 'busy' could be something like
>
   $ cat ~/bin/busy
   typeset busy='/-\|'
   typeset -i i=0
   alarm -r timer +0.25
   function timer.alarm { print -u2 -f "%c\b" -- "${busy:i++%4:1}" ;}
   ( "$@" & wait )
   unset timer
>
with 'alarm' and 'timer.alarm' used as supported by ksh93u+.
>
I suppose the 'at' command is not suited for such purposes.

>
Remember how I rigged something up in the Basta project to spontaneously
update the clock in the status line, while the shell is waiting for
input or running scripts?
>
Forked process periodically killing parent with signal, which has a trap
handler for it.

 Yes, I remember. There's a couple options to solve such a task. In case
I have a simple built-in method available I'd prefer that, though.
 Janis
 

I think several OSes have a tool called 'progress' which sort of functions as you've described; NetBSD does natively.  Having it built-in would be better though.  Was 'alarm' removed in ksh93?  I don't see it on the NetBSD pkgsrc version.