I'd like to see this get added natively


As for methodology, here's what I'd use:


Code
;; /onthehour name /command
alias onthehour {
  if ($isid) {
    ;; could do whatever here
    return
  }

  ;; cleanup incase the timer is being overwritten  
  if ($timer($1)) {
    .timer $+ $1 off
  }
  if (%onthehour. [ $+ [ $1 ] ]) {
    unset %onthehour. [ $+ [ $1 ] ]
  }
  
  ;; set to 59secs to reduce the chance of timer skipping *:00; def not full proof
  .timer $+ $1 -io 1 59 onthehourcheck $unsafe($1-)
}


// local: /onthehourcheck name /command
alias -l onthehourcheck {
  if ($asctime(n) || %onthehour. [ $+ [ $1 ] ]) {
    return
  }

  ;; run the command  
  ;; deviation: if the command errors, the timer is stopped unlike a typical 'forever' timer
  $2-

  ;; update state so as not to allow the timer to trigger in the next 45 minutes
  set -eu2700 %onthehour. [ $+ [ $1 ] ] $true

  ;; restart the timer
  .timer $+ $1 -io 1 59 onthehourcheck $unsafe($1-)
}

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