Replace your existing crontab with your custom crontab file
[server]$ crontab /home/username/filename
Edit your server's crontab
[server]$ crontab -e
View your crontab
[server]$ crontab -l
Remove your crontab
[server]$ crontab -r
[server]$ crontab /home/username/filename
[server]$ crontab -e
[server]$ crontab -l
[server]$ crontab -r