How to set a cron?

Set a cronjob file

Please check the details Below 

which represent that how can you set a cron job on time basis 

 .---------------- minute (0 - 59)
 |  .------------- hour (0 - 23)
 |  |  .---------- day of month (1 - 31)
 |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
 |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7)
 |  |  |  |  |
 *  *  *  *  *   command to be executed

Example 1: Set cron job run per minute 
* * * * * /usr/bin/php /var/www/vhosts/site/cron/mycron.php

Example 2: Set cron job to run on a specific time every day 5:50am
50 5 * * * /usr/bin/php /var/www/vhosts/site/cron/mycron.php

Example 3: Set cron job to run on a specific time every day 10:50pm

50 22 * * * /usr/bin/php /var/www/vhosts/site/cron/mycron.php

Example 4: Set cron job to run on every sunday 1am

00 1 * * 0 /usr/bin/php /var/www/vhosts/site/cron/mycron.php

Example 5: Set cron job to run on every sunday 1am 

00 1 * * Sun /usr/bin/php /var/www/vhosts/site/cron/mycron.php

Example 5: Set cron job to Runs at 9:45 am on the first day of every month 

45 9 1 * * /usr/bin/php /var/www/vhosts/site/cron/mycron.php