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From: isabella parakiss <izaberina@gmail.com>
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Subject: Re: Proposed Prompt Escapes
Date: Thu, 19 Nov 2015 05:49:46 +0100
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On 11/19/15, =C3=81ngel Gonz=C3=A1lez <angel@16bits.net> wrote:
> Dennis Williamson wrote:
>> Do you mean something like:
>>
>> PS1=3D'$SECONDS '
>
> Not exactly. $SECONDS is the number of seconds since the shell was
> started. I am interested in the seconds elapsed by the last command.
>
> It is a hacky solution, but it could be done with:
>> PS1=3D''; PROMPT_COMMAND=3D'printf "%s " $SECONDS; SECONDS=3D0'
>
>

You need to reset it right before the command is executed, PROMPT_COMMAND
is evaluated when the prompt is drawn, before you type your command.
A debug trap is better suited, but you have to make sure that it's only
executed once in a complex line.

Something along these lines should work:

PROMPT_COMMAND=3Ddebug_trap=3D0
trap '((!debug_trap++))&&SECONDS=3D0' debug
PS1=3D'$SECONDS \$ '


---
xoxo iza