Replace 'here string' syntax with echo + pipe

bin/restic_backup.sh

@@ -122,12 +122,11 @@ echo "Backup & cleaning is done."
 #
 if [ "$RESTIC_NOTIFY_BACKUP_STATS" = true ]; then
 	if [ -w "$RESTIC_BACKUP_NOTIFICATION_FILE" ]; then
-		added=$(grep -i 'Added to the repo:' <<< "$backup_output" | sed -E 's/.*dded to the repo: (.*)/\1/')
+		added=$(echo "$backup_output" | grep -i 'Added to the repo:' | sed -E 's/.*dded to the repo: (.*)/\1/')
 		# sample:  processed N files, N.XYZ GiB in H:mm
-		size=$(grep  -i 'processed.*files,'  <<< "$backup_output" | sed -E 's/.*rocessed.*files, (.*) in.*/\1/g')
+		size=$(echo "$backup_output" | grep  -i 'processed.*files,' | sed -E 's/.*rocessed.*files, (.*) in.*/\1/g')
 		echo "Added: ${added}. Snapshot size: ${size}" >> "$RESTIC_BACKUP_NOTIFICATION_FILE"
 	else
 		echo "[WARN] Couldn't write the backup summary stats. File not found or not writable: ${RESTIC_BACKUP_NOTIFICATION_FILE}"
 	fi
 fi
-

etc/restic/_global.env.sh

@@ -30,7 +30,6 @@ export RESTIC_BACKUP_EXTRA_ARGS=
 # Override this value in a profile if needed.
 export RESTIC_VERBOSITY_LEVEL=0
 
-# (optional) Desktop notifications
+# (optional) Desktop notifications. See restic_backup.sh for details on how to set this up.
 export RESTIC_NOTIFY_BACKUP_STATS="false"
 export RESTIC_BACKUP_NOTIFICATION_FILE=""
-