How to schedule "topas" command in crontab

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crontab

CRONTAB(1)						    BSD General Commands Manual 						CRONTAB(1)

NAME

     crontab -- maintain crontab files for individual users (V3)

SYNOPSIS

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

DESCRIPTION

     The crontab utility is the program used to install, deinstall or list the tables used to drive the cron(8) daemon in Vixie 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 allow file exists, then you must be listed therein in order to be allowed to use this command.  If the allow file does not exist but
     the deny file does exist, then you must not be listed in the deny file in order to use this command.  If neither of these files exists, then
     depending on site-dependent configuration parameters, only the super user will be allowed to use this command, or all users will be able to
     use this command.	The format of these files is one username per line, with no leading or trailing whitespace.  Lines of other formats will
     be ignored, and so can be used for comments.

     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 given.

     The following options are available:

     -u      Specify the name of the user whose crontab is to be tweaked.  If this option is not given, crontab examines ``your'' crontab, i.e.,
	     the crontab of the person executing the command.  Note that su(1) can confuse crontab and that if you are running inside of su(1) you
	     should always use the -u option for safety's sake.

     -l      Display the current crontab on standard output.

     -r      Remove the current crontab.

     -e      Edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables.  The specified editor must edit
	     the file in place; any editor that unlinks the file and recreates it cannot be used.  After you exit from the editor, the modified
	     crontab will be installed automatically.

FILES

     /var/cron/allow  List of users allowed to use crontab
     /var/cron/deny   List of users prohibited from using crontab
     /var/cron/tabs   Directory for personal crontab files

DIAGNOSTICS

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

SEE ALSO

     crontab(5), cron(8)

STANDARDS

     The crontab command conforms to IEEE Std 1003.2 (``POSIX.2'') with the exception that the dangerous variant of calling crontab without a file
     name in the first form of the command is not allowed by this implementation.  The pseudo-filename '-' must be specified to read from standard
     input.  The new command syntax differs from previous versions of Vixie Cron, as well as from the classic SVR3 syntax.

AUTHORS

     Paul Vixie <paul@vix.com>

BSD
								   May 13, 2010 							       BSD

UNIX for Advanced & Expert Users