To set up a WordPress cron job using the command line, follow these steps:

1. Log in to your account using SSH.
2. At the command prompt, type the following command:

crontab -e

1. Type o to enter editing mode and start a new line of text.
2. Type the following line, replacing username with your own cpanel account username:

*/30 * * * *  cd /home/username/public_html; /usr/local/bin/php -q wp-cron.php

NB:This line sets the cron job to run every 30 minutes.

3. Press Esc, type : wq and then press Enter. The new cron job settings take effect immediately.