Execute crontab for every 4 hours and begin from current time

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bcrontab

bcrontab(1)						      General Commands Manual						       bcrontab(1)

NAME

       bcrontab - Manage users crontab files

SYNOPSIS

       bcrontab [ -u user ] file

       bcrontab [ -u user ] { -l | -r | -e }

DESCRIPTION

       bcrontab interfaces with the bcron-spool daemon to manage crontab files in the privileged spool directory.

OPTIONS

       -u user
	      Tell  bcron-spool  that we are acting on behalf of the named user.  bcron-spool will only accept the username if bcrontab is running
	      as either root or the same user ID as the named user.

       -l     List the cronab crontab to standard output.

       -r     Remove the user's crontab.

       -e     Edit the current crontab.

ENVIRONMENT

       VISUAL If this is set, it is used as the editor to invoke to edit a crontab.

       EDITOR If $VISUAL is not set and this is, it is used as the editor to invoke to edit a crontab.	If neither are set, /bin/vi is used.

       BCRON_SOCKET
	      The path to the named socket used to communicate with bcron-spool.  Defaults to /var/run/bcron-spool.

       LOGNAME

       USER   These two variables are used, in order, to determine the user name invoking the program.	One must be set if the -u  option  is  not
	      used.

FILES

       bcrontab  tries	to  writes  a  temporary  file	into the current directory, and then into /tmp if that fails, in order to edit the current
       crontab.

SEE ALSO

       bcron-spool(8), crontab(5)

AUTHOR

       Bruce Guenter <bruceg@em.ca>

																       bcrontab(1)

UNIX for Dummies Questions & Answers