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 exam-
    ines "your" crontab, i.e., the crontab of the person executing the com-
    mand.  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 automati-
    cally.

SEE ALSO
    crontab(5), cron(8)

FILES
    /etc/cron.allow
    /etc/cron.deny

STANDARDS
    The crontab command conforms to IEEE Std1003.2-1992 (``POSIX''). This
    new command syntax differs from previous versions of Vixie Cron, as
    well as from the classic SVR3 syntax.

DIAGNOSTICS
    A fairly informative usage message appears if you run it with a bad
    command line.

AUTHOR
    Paul Vixie <paul@vix.com>