Help with bash script that fails after suspend to RAM

Question

I have a very simple reminder script that uses an endless loop, sleep and zenity to pop up a reminder every twenty minutes:
#!/bin/bash
while true;
do
sleep 20m
zenity --warning --title="Ergonomics Reminder" --text="Check Posture or Have a Stretch!"
done
However, it does not work as it should after suspending to RAM. I am thinking I need to kill the process and restart it after every suspend, using a "thaw" notice in /etc/pm but if there is an easier way to do it please let me know!

Answer 1

I'm doing this for 2 reasons:
- as a scripting exercise
- because the local repo is a shared wordpress mess and people forget to make commits so I'd like a local backup that includes all changes that may not be in github (sadly).
Anyhow, thanks for the input about trap, I'm definitely confused by it's use at this point but have reworked the script without it.
#!/bin/sh
set -e #Exit on any error.
TIME=`date +"%m.%d.%Y@%H:%M:%S"` # Define the TIME variable as today's date and time.
MONTH=`date +"%b"` # Define MONTH as today's month.
FILENAME="backup-$TIME.tar.gz" # Define the filename structure.
SRCDIR="/stuff" # Define folder to backup.
DESDIR="/Backup/$MONTH/" # Define the backup folder location.
LOGFILE="$DESDIR/backup-$TIME.log" # Store the output in a log.
REMOTE=$(git ls-remote -h origin master | awk '{print $1}') # Get commit hash from head of remote master repo (github)
LOCAL=$(git rev-parse HEAD) # Get commit hash from head of server repo (dev/test)
if [[ $LOCAL == $REMOTE ]]; then # If the hashes match
echo "No update required." >> $LOGFILE # Then no pull is needed
else # If the hashes don't match then prepare to run our backup
mkdir -p $DESDIR # Create our directory if it doesn't exist.
echo "Backup started for "$TIME >> $LOGFILE # Make it log what it's doing.
tar -cpzf $DESDIR/$FILENAME $SRCDIR >> $LOGFILE 2>&1 # Perform the backup.
echo "Backup Finished for "$TIME >> $LOGFILE # Log that it's finished.
echo "Preparing for git pull " >> $LOGFILE #Log what we're doing.
cd /stuff >> $LOGFILE 2>&1 # Make sure we're in our repo directory
git pull >> $LOGFILE 2>&1
echo "Git pull completed successfully. " >> $LOGFILE
mail -s "Backup log `date`" [email protected] < $LOGFILE # Email the output to me.
fi