crontab(1)                                                   crontab(1)

  crontab

  NAME

    crontab - schedule periodic jobs to run in the background

  SYNOPSIS

    crontab [-u user] [file]
    crontab [-u user] {-e|-l|-p|-r}

  DESCRIPTION

    The crontab(1) utility manipulates your crontab entry, which is a list of
    commands and when they should be run in the background. You can replace
    your crontab entry with a new one specified by file (or standard input if
    you do not specify file), or you can use the command crontab -e to edit
    your entry directly.

    To run crontab(1), one of the following must apply to you:

    *     You are logged on using the local Administrator account.
    *     Your user name appears in the /usr/lib/cron/cron.allow file.
    *     The /usr/lib/cron/cron.allow file does not exist and your user name
          does not appear in the /usr/lib/cron/cron.deny file.

    If neither the cron.allow file nor the cron.deny file exists, only the
    local Administrator can run crontab(1).

    The crontab(1) utility takes the following options:

    -e
        Edit your crontab entry; if there is no entry, create an empty one to
        edit. The crontab(1) utility uses the editor specified by your EDITOR
        environment variable.

    -l
        List your crontab entry.

    -p
        Register the current user's password for use by the cron daemon. The
        cron daemon will use this password to impersonate this user to execute
        any crontab entries submitted by this user.

    -r
        Remove your crontab entry.
    -u user
        Specify user.

    For the syntax and semantics of a crontab file, see crontab(5).

  ENVIRONMENT VARIABLES

    The crontab(1) utility uses the following environment variable:

    EDITOR
        The name of the editor to be used when editing a crontab entry.

  DIAGNOSTICS

    On success, crontab(1) returns 0; if an error occurred, it returns >0.

  NOTES

    By default, Interix does not execute files with the set-user-ID (setuid)
    or set-group-ID (setgid) mode bit set for security reasons. If an attempt
    is made to execute such a file, the ENOSETUID error is returned. For more
    information and and instructions for enabling execution of files with
    these mode bits set, see The superuser account and appropriate privileges
    in Windows Services for UNIX Help.

  SEE ALSO

    at(1)

    batch(1)

    cron(1)

    crontab(5)