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Script that will look the same as Cron

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Top Forums Shell Programming and Scripting Script that will look the same as Cron
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Old 08-13-2019
Quote:
Originally Posted by rbatte1

Can you say why you are not permitted to use a scheduler? Anything else is either a bad solution calling at repeatedly (probably also restricted) or requires you to have code running all the time all over the place which is exposed to failure and is unlikely to get restarted on boot until you restart it.
My best guest is that it is disguised schoolwork. When people post these types of posts the main reason is that their instructor has told them to "write a script like cron" and then they make up a story about "not having access to cron at work," for example, to get others to help them online.

That's my experience over the past two decades as to why people ask questions with such "constraints" and insist on using a particular solution or approach.
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LEARN ABOUT NETBSD

crontab

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

NAME

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

SYNOPSIS

     crontab [-u user]
     crontab [-elr]

DESCRIPTION

     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/cron, they are not intended to be edited directly.

     If the /var/cron/allow file exists, then you must be listed therein in order to be allowed to use this command.  If the /var/cron/allow file
     does not exist but the /var/cron/deny file does exist, then you must not be listed in the /var/cron/deny file in order to use this command.
     If neither of these files exists, depending on the compiled in settings, only the super user will be allowed to use this command, or everyone
     will be allowed to use this command.  On NetBSD everyone is allowed to use this command.

     The default maximum size for a crontab is 256 kilobytes, but this may be changed for all users on the system by putting the desired maximum
     size (in bytes) in the /var/cron/maxtabsize file.

     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 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.

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

     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 automatically.

FILES

     /var/cron/allow	   Optional list of users that are allowed to use crontab.
     /var/cron/deny	   Optional list of users that are disallowed to use crontab.
     /var/cron/maxtabsize  Maximum size of crontab files.  Defaults to 256 kilobytes.
     /var/cron/tabs/	   Directory containing the individual user crontab files, named after the user.

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'').  This new command syntax differs from previous versions of Vixie Cron, as well
     as from the classic Version 3 AT&T UNIX syntax.

AUTHORS

     Paul Vixie <vixie@isc.org>

BSD
								    May 6, 2010 							       BSD