Re: Proposed Prompt Escapes

[isabella parakiss]

On 11/19/15, Ángel González <angel@16bits.net> wrote:
> Dennis Williamson wrote:
>> Do you mean something like:
>>
>> PS1='$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=''; PROMPT_COMMAND='printf "%s " $SECONDS; SECONDS=0'
>
>

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=debug_trap=0
trap '((!debug_trap++))&&SECONDS=0' debug
PS1='$SECONDS \$ '


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xoxo iza