updated notes

src/rhcsa.md

@@ -212,6 +212,24 @@ sudo nano /etc/fstab # Add the following line to the fstab file: UUID=1234567890
 sudo mount -a # Mount all filesystems
 ```
 
+## Automatic Services & Task Scheduling
+
+### cron
+```bash
+sudo crontab -e # Edit the cron table
+
+sudo crontab -l # List the cron table
+
+### crontab format
+```
+* * * * * command # Run the command every minute
+
+0 12 * * * command # Run the command at 12:00 PM
+
+0 0 * * * command # Run the command at 12:00 AM
+```
+
+