waitUntil

‘Native’

While this naive code might look interesting it’s actually quite a cpu eater

#!/bin/bash

#set -x

# waitUntil
# This should run 'thecode' at approximate real-clock minute change.

update() {
    # minutes from real clock without 0 padding
    oldmin="$(date +%-M)"
    newmin="$oldmin"
    #echo "$newmin"
}

waitUntil() {
while (( oldmin == newmin ))
do
  sleep 0.3
  newmin="$(date +%-M)"
done
}

thecode() {

    clear
    date +%H%M | toilet -f 3x3
    
}

while true
do

    thecode
    update
    waitUntil

done

Some debate.

Datetools

Similar, but using datetools

#!/bin/bash

#set -x

# waitUntil2, using https://github.com/caronc/datetools dateblock
# This should run 'thecode' at approximate real-clock minute change.

waitUntil() {

    dateblock -n /1

}

thecode() {

    date +%H%M | toilet -f 3x3
    
}

while true
do

    thecode
    waitUntil

done

Cron

Using cron, lags about 1s

in crontab have

* * * * * touch /tmp/clock

script might look like

date +%H%M; while inotifywait -qq -e close_write /tmp/clock; do date +%H%M; done
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