/usr/local/etc/anacrontab describes the jobs controlled by anacron(8). Its lines can be of
three kinds: job-description lines, environment
assignments, or empty lines.
Job-description lines are of the form:
period delay job-identifier command
period is specified in days, the
delay in minutes. The
job-identifier can contain any non-blank character, except slashes. It is used to identify
the job in Anacron messages,
and as the name for the jobs timestamp file. The
command can be any shell command.
Environment assignment lines are of the form:
VAR = VALUE
VAR are removed. No spaces around
VALUE are allowed (unless you want them to be part of the value). The assignment
takes effect from the next line to the end of the file, or to the next
assignment of the same variable.
Empty lines are either blank lines, line containing white-space only, or
lines with white-space followed by a # followed by an arbitrary comment.