crontab

##======================================================================
##
## This is a crontab template. If you have an existing crontab on
## another system, you can capture it like this:
##
##    $ crontab -l >User.crontab
##
## Then, after you move User.crontab to this system, you can import it:
##
##    $ crontab User.crontab
##
##======================================================================
##
##   References:  man 5 crontab
##                https://crontab.guru
##
##   Special keys:
##
##     Key       Meaning
##     @yearly   Run once a year  yyyy-01-01 00:00:00
##     @monthly  Run once a month yyyy-mm-01 00:00:00
##     @weekly   Run once a week  yyyy-mm-ss 00:00:00 (ss = Sunday)
##     @daily    Run once a day   yyyy-mm-dd 00:00:00
##     @hourly   Run once an hour yyyy-mm-dd hh:00:00
##     @reboot   Run at cron daemon startup
##
##   General command syntax:
##
##     *    *    *    *    *    command
##     ┬    ┬    ┬    ┬    ┬
##     │    │    │    │    └───── * = 0-7  day of week (0=7=Sunday)
##     │    │    │    └────────── * = 1-12 month of year
##     │    │    └─────────────── * = 1-31 day of month
##     │    └──────────────────── * = 0-23 hour of day
##     └───────────────────────── * = 0-59 minute of hour
##
##======================================================================

# Your own crontab should contain the SHELL and PATH lines. Do not omit.
# Fix PATH if «HOMEDIR»/.local/bin does not exist. You must use absolute
# paths here. You can't use $HOME, ~ or $PATH (a crontab restriction).
SHELL=/bin/bash
PATH=«HOMEDIR»/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

# example commands (these are all "live" - you should delete them)
#min hour mday mon  wday command
*/10 *    *    *    *    echo "hh:00 hh:10 hh:20 hh:30 hh:40 hh:50" >/dev/null
10   */3  *    *    *    echo "00:10 03:10 06:10 09:10 12:10 ..."   >/dev/null
15   9-17 *    *    *    echo "09:15 10:15  ...  16:15 17:15"       >/dev/null
20   3    */7  *    *    echo "03:20 mod(julianDayOfYear,7)=0"      >/dev/null
59   23   30   6    *    echo "23:59 yyyy-06-30"                    >/dev/null
0    7    *    *    1    echo "Rise and shine! It's 7am Monday!"    >/dev/null
@reboot                  echo "cron daemon starts after reboot"     >/dev/null