Crontab tips
edit – “contrab -e”
to list “crontab -l”
Link to Manpage online – https://man7.org/linux/man-pages/man5/crontab.5.html
// shamelessly stolen from stackoverflow crontab does not understand "intervals", it only understands "schedule" valid hours: 0-23 -- valid minutes: 0-59 example #1 30 * * * * your_command this means "run when the minute of each hour is 30" (would run at: 1:30, 2:30, 3:30, etc) example #2 */30 * * * * your_command this means "run when the minute of each hour is evenly divisible by 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc) example #3 0,30 * * * * your_command this means "run when the minute of each hour is 0 or 30" (would run at: 1:30, 2:00, 2:30, 3:00, etc) it's another way to accomplish the same results as example #2 example #4 19 * * * * your_command this means "run when the minute of each hour is 19" (would run at: 1:19, 2:19, 3:19, etc) example #5 */19 * * * * your_command this means "run when the minute of each hour is evenly divisible by 19" (would run at: 1:19, 1:38, 1:57, 2:19, 2:38, 2:57 etc)