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Managing System Information, Processes, and Performance in Oracle® Solaris 11.4

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Updated: August 2018
 
 

Syntax of crontab File Entries

A crontab file consists of commands, one command per line, that execute automatically at the time specified by the first five fields of each command line, which are separated by spaces.

Table 7  Acceptable Values for crontab Time Fields
Time Field
Values
Minute
0-59
Hour
0-23
Day of month
1-31
Month
1-12
Day of week
0-6 (0 = Sunday)

    The guidelines for using special characters in crontab time fields are as follows:

  • Use a space to separate each field

  • Use a comma to separate multiple values

  • Use a hyphen to designate a range of values

  • Use an asterisk as a wildcard to include all possible values

  • Use a comment mark (#) at the beginning of a line to indicate a comment or a blank line

For example, the following crontab command entry displays a reminder in the user's console window at 4 pm on the first and fifteenth days of every month.

0 16 1,15 * * echo Timesheets Due > /dev/console

Each command within a crontab file must consist of one line, even if that line is very long. The crontab file does not recognize extra carriage returns. For more detailed information about crontab entries and command options, refer to the crontab(1) man page.