CRONTAB(1) MachTen Programmer’s Manual CRONTAB(1)

NAME
crontab - maintain crontab files for individual users (V3)

SYNOPSIS
crontab [ -u user ] file
crontab [ -u user ] [ -l | -r | -e ]

DESCRIPTION
Crontab is the program used to install, deinstall or list
the tables used to drive the cron(8) daemon in Vixie Cron.
Each user can have their own crontab, and though these are
files in /var, they are not intended to be edited
directly.

If the allow file exists, then you must be listed therein
in order to be allowed to use this command. If the allow
file does not exist but the deny file does exist, then you
must not be listed in the deny file in order to use this
command. If neither of these files exists, then depending
on site-dependent configuration parameters, only the super
user will be allowed to use this command, or all users
will be able to use this command.

If the -u option is given, it specifies the name of the
user whose crontab is to be tweaked. If this option is
not given, crontab examines "your" crontab, i.e., the
crontab of the person executing the command. Note that
su(8) can confuse crontab and that if you are running
inside of su(8) you should always use the -u option for
safety’s sake.

The first form of this command is used to install a new
crontab from some named file or standard input if the
pseudo-filename ‘‘-’’ is given.

The -l option causes the current crontab to be displayed
on standard output.

The -r option causes the current crontab to be removed.

The -e option is used to edit the current crontab using
the editor specified by the VISUAL or EDITOR environment
variables. After you exit from the editor, the modified
crontab will be installed automatically.