Use the following, if you want to check the disk space every 10 minutes.
*/10 * * * * /home/ramesh/check-disk-space
It executes the specified command check-disk-space every 10 minutes through out the year. But you may have a requirement of executing the command only during office hours or vice versa. The above examples shows how to do those things.
Instead of specifying values in the 5 fields, we can specify it using a single keyword as mentioned below.
There are special cases in which instead of the above 5 fields you can use @ followed by a keyword — such as reboot, midnight, yearly, hourly.
|@yearly||0 0 1 1 *|
|@daily||0 0 * * *|
|@hourly||0 * * * *|
|@reboot||Run at startup.|