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Annotation of coherent/d/etc/SYSVcron/README.crontab, revision 1.1

1.1     ! root        1: crontab - Command
        !             2: /usr/bin/crontab
        !             3: 
        !             4: crontab [-u user_name] ...\n
        !             5:        -l                       list user's crontabab
        !             6:        -r                       remove user's crontab
        !             7:        -f file_name             replace user's crontab
        !             8:        -m e[nable]/d[isable]    enable/disable mail
        !             9: 
        !            10: CRONTAB command copies the file, or standart input if file name is "-", into
        !            11: a directory /usr/spool/cron/crontabs that holds all crontabs. 
        !            12: 
        !            13: -u user        allows to specify a user name. Only superuser allows to use user
        !            14:                name different from its own. Default is effective user name.
        !            15: -l             list the user crontab.
        !            16: -r             remove user crontab.
        !            17: -f file_name   replace user crontab with specify file.
        !            18: -m e/d                 enable/disable mail to the user about the failed command.
        !            19: 
        !            20: The next table shows conditions when user is allowed to use crontab.
        !            21:     
        !            22:      \ deny     exist        exist              exist          doesn't
        !            23:       \         is user      no user          but empty        exist
        !            24:  allow \
        !            25:  _______\________________________________________________________________
        !            26:   exist  |        
        !            27:  is user |        Y             Y               Y               Y
        !            28:  ------------------------------------------------------------------------
        !            29:   exist  |
        !            30:  no user |        N              N               N               N       
        !            31:  ------------------------------------------------------------------------
        !            32:   doesn't|
        !            33:    exist |        N              Y               Y               N
        !            34: 
        !            35: Where deny means the file /usr/lib/cron/cron.deny, and allow is
        !            36: the file /usr/lib/cron/cron.allow
        !            37: This table is not valid for user root hwich can always use crontab.
        !            38: 
        !            39:        Directories and files
        !            40: 
        !            41: /usr/lib/cron                  main cron directory.
        !            42:        700 root root
        !            43: /usr/lib/cron/FIFO             lock file (named pipe).
        !            44:        created by crond; removed by crond/rc
        !            45: /usr/lib/cron/cron.allow       list of allowed users.
        !            46:        600 root root
        !            47: /usr/lib/cron/cron.deny                list of denied users.
        !            48:        600 root root
        !            49: /usr/lib/crontab               old crontab entry. 
        !            50: /usr/spool/cron                        spool directory parent
        !            51:        700 root root
        !            52: /usr/spool/cron/crontabs       spool directory
        !            53:        700 root root
        !            54: 
        !            55: #/usr/lib/cron/log             accounting information (not used).
        !            56: #/etc/default/cron             user config. file (not used).
        !            57: 
        !            58: Old crontab entry. We will use it for the backword compatibility.
        !            59: /usr/lib/crontab
        !            60: 
        !            61: NOTICE: COHERENT crontab is superset of SV crontab command.
        !            62: The main differences are: 
        !            63:        COHERENT crontab prints the usage, when no options have been chosen,
        !            64:        SV reads stdin and can just remove user crontab;
        !            65:        options -f file_name doesn't exist under SV. That cause non traditional
        !            66:        usage of SV crontab;
        !            67:        options -u user doesn't exist under SV. That means when you want
        !            68:        to maintain a crontab for somebody else (uucp) you have to use 
        !            69:        "su user_name" before invoke crontab.

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