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Annotation of coherent/a/usr/man/COHERENT/cron, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: cron                    System Maintenance                   cron
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        !             8: Execute commands periodically
        !             9: 
        !            10: /etc/cron&
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        !            12: cron is  a daemon  that executes  commands at preset  times.  The
        !            13: commands and their scheduled execution times are kept in the file
        !            14: /usr/lib/crontab.
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        !            16: Once each minute cron searches through crontab.  For each command
        !            17: stored there,  cron compares the current  time with the scheduled
        !            18: execution time and executes the command if the times match.  When
        !            19: it  finishes  the  search, cron  sleeps  until  the next  minute.
        !            20: Because it  never exits, cron should be  executed only once (cus-
        !            21: tomarily by /etc/rc).
        !            22: 
        !            23: crontab consists of  lines separated by newlines.  Each line con-
        !            24: sists of  six fields separated  by white space  (tabs or blanks).
        !            25: The first  five fields describe  the scheduled execution  time of
        !            26: the  command.  Respectively,  they represent  the  minute (0-59),
        !            27: hour (0-23),  day of the month (1-31), month  of the year (1-12),
        !            28: and day  of the week  (0-6, 0 indicates Sunday).   Each field may
        !            29: contain a single integer in  the appropriate range, a pair of in-
        !            30: tegers separated  by a hyphen  `-' (meaning all  integers between
        !            31: the two, inclusive),  an asterisk `*' (meaning all legal values),
        !            32: or a  comma-separated list of the above  forms.  The remainder of
        !            33: the line gives the command to be executed at the given time.
        !            34: 
        !            35: For example, the ccrroonnttaabb entry
        !            36: 
        !            37: 
        !            38:         29 * * 7 0 msg henry Succotash!
        !            39: 
        !            40: 
        !            41: means  that every  hour on  the half-hour  during each  Sunday in
        !            42: July,  ccrroonn will invoke the command mmssgg, and the user named hheennrryy
        !            43: will have the message
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        !            45: 
        !            46:         daemon: Succotash!
        !            47: 
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        !            49: written on his terminal's screen (if he is logged in).
        !            50: 
        !            51: cron recognizes three  special characters and escape sequences in
        !            52: the crontab.   If a command  contains the percent  character `%',
        !            53: cron executes only  the portion up to the first  `%' as a command
        !            54: and passes  the remainder to  the command as  its standard input.
        !            55: cron translates  any percent characters  `%' in the  remainder to
        !            56: newlines.  The special  interpretation of `%' can be prevented by
        !            57: preceding it  with a backslash, `\%'.   Finally, cron removes the
        !            58: sequence \<nneewwlliinnee> from the  text before passing it to the shell
        !            59: sh;  this can  be  used to  make  an entry  in  the crontab  more
        !            60: legible.
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        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            68: 
        !            69: cron                    System Maintenance                   cron
        !            70: 
        !            71: 
        !            72: 
        !            73: cron is  designed for commands  that must be  executed regularly.
        !            74: Temporal commands  that need to  be executed only  once should be
        !            75: handled with the command at.
        !            76: 
        !            77: ***** Files *****
        !            78: 
        !            79: /uussrr/lliibb/ccrroonnttaabb for stored commands
        !            80: 
        !            81: ***** See Also *****
        !            82: 
        !            83: at, init, system maintenance
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        !           130: COHERENT Lexicon                                           Page 2
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