CRONTAB(1)                                                          CRONTAB(1)


       crontab - maintain crontab files for individual users (ISC Cron V4.1)


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


       Crontab  is  the  program used to install, deinstall or list the tables
       used to drive the cron(8) daemon in ISC 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 cron.allow file exists, then you must be listed therein in order
       to  be  allowed  to  use this command.  If the cron.allow file does not
       exist but the cron.deny file does exist, then you must not be listed in
       the  cron.deny  file in order to use this command.  If neither of these
       files exists, only the super user will be allowed 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

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

       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-

       The -i option modifies the -r option to prompt the  user  for  a  ’y/Y’
       response before actually removing the crontab.


       crontab(5), cron(8)




       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.


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


       Paul Vixie <>

4th Berkeley Distribution      29 December 1993                     CRONTAB(1)

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