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README.txt

# INSTALLING (Running the meter poller as a user service)

# Put the script in ~/.local/bin/run_in_loop.sh (and make it executable) and the service description in ~.config/systemd/user/meter-poller.service .

# Allow your user to run service while not logged in (only needed once this computer)
sudo loginctl enable-linger $USER

# Tell systemd to start meter-poller.service at boot (done by installing symlinks)
systemctl --user enable meter-poller.service

# Tell systemd to also start the meter-poller.service now
systemctl --user start meter-poller.service

# Check the status of the service (is it running? proces tree, stdout log, etc)
systemctl --user status meter-poller.service

# Check the log for the service
journalctl --user-unit meter-poller.service -e
# Replace -e with -f to "follow" the output of the service live

# See all the user services running (cool colors! trees!)
systemctl --user status

# Reload the service config
systemctl --user daemon-reload

# Restart the service
systemctl --user restart meter-poller.service

# UNINSTALLING

# Stop service
systemctl --user stop meter-poller.service

# Disable automatic start
systemctl --user disable meter-poller.service

# You can now remove the files

meter-poller.service

[Unit]
Description=Electricity Meter Polling Service

[Service]
ExecStart=%h/.local/bin/run_in_loop.sh 10 poll_meter.sh
Restart=always

[Install]
WantedBy=default.target

run_in_loop.sh

#!/usr/bin/env bash

if (( $# < 2 )); then
    echo "Usage: run_in_loop.sh <seconds> <command> <arg1> <arg2> ..."
    exit 1
fi

interval=$1
shift

while true; do
  "$@"
  sleep $interval
done