Handy snippet to depending behaviour on hour in bash

depend_on_hour.sh

echo 'Current hour'
hour=$(date +%H);
if [ $hour -gt 9 -a $hour -lt 23  ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour;

echo 'Test around the clock:'
for hour in {0..23} {0..23}; do
if [ $hour -gt 9 -a $hour -lt 23  ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour;
done

echo 'If you need to depend on UTC, just add `-u` flag to `date` command'

pause_and_resume_bitcoind.sh

# Example of depend_on_hour modification, that pauses and resumes bitcoind on given times.
# Purpose? Quieter disks at night :)
# Set this script with cron or systemd-timers

echo 'Current hour'
hour=$(date +%H);
if [ $hour -gt 9 -a $hour -lt 23  ]; then
set -x
killall -v -CONT bitcoind
else
set -x
killall -v -STOP bitcoind
fi;

This may be also helpful:
pgrep -f 'rsync./path.' -a # to investigate
pkill -CONT -f "rsync./path." # and to catch -CONT or -STOP