Anyone know how to get a cron to run twice a week? I want this email script to send out the same email twice a week, but am not sure which cron settings I should use.
cron have format like that, please check it accordingly.
minute hour day month dayofweek command
* minute — any integer from 0 to 59
* hour — any integer from 0 to 23
* day — any integer from 1 to 31 (must be a valid day if a month is specified)
* month — any integer from 1 to 12 (or the short name of the month such as jan, feb, and so on)
* dayofweek — any integer from 0 to 7 where 0 or 7 represents Sunday (or the short name of the week such as sun, mon, and so on)
* command — the command to execute. The command can either be a command such as ls /proc >> /tmp/proc or the command to execute a custom script that you wrote.
For any of the above values, an asterisk (*) can be used to specify all valid values. For example, an asterisk for the month value means execute the command every month within the constraints of the other values.
A hyphen (-) between integers specifies a range of integers. For example, 1-4 means the integers 1, 2, 3, and 4.
A list of values separated by commas (,) specifies a list. For example, 3, 4, 6, 8 indicates those four specific integers.
The forward slash (/) can be used to specify step values. The value of an integer can be skipped within a range by following the range with /<integer>. For example, 0-59/2 can be used to define every other minute in the minute field. Step values can also be used with an asterisk. For instance, the value */3 can be used in the month field to run the task every third month.
Any lines that begin with a hash mark (#) are comments and are not processed.
Examples of crontabs
# record the memory usage of the system every monday
# at 3:30AM in the file /tmp/meminfo
30 3 * * mon cat /proc/meminfo >> /tmp/meminfo
# run custom script the first day of every month at 4:10AM
10 4 1 * * /root/scripts/backup.sh