I can't find any material on how to create hours with minute components within a single expression.
1 Answer
There is no way to run this particular cron job in just a single expression, but it could be done in three:
15-59 7 * * * echo "This command runs every minute from 7:15am to 7:59am"
0-59 8-19 * * * echo "This command runs every minute from 8:00am to 7:59pm"
0-30 20 * * * echo "This command runs every minute from 8:00pm to 8:30pm"POSIX cron allows you to use dashes (-) to define a range of units (0-59), or commas (,) to define a list of units (0,2,4,6,8). Some cron variants also allow using slashes (/) to define evenly recursing units (*/15 is the same as 0,15,30,45).
Unfortunately, none of those work when you have an unusual beginning and end like your example does.
