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Full Discussion: Script that will look the same as Cron
Top Forums Shell Programming and Scripting Script that will look the same as Cron Post 303037674 by drysdalk on Friday 9th of August 2019 09:51:29 AM
Old 08-09-2019
Hi,

Using the approach from my script, you would just tweak the runtime variable accordingly. For instance, in the provided example:

Code:
runtime=`/usr/bin/date -d '2019-08-09 14:22:00' +%s`

the target time is very specifically 14:22:00 on the 9th of August 2019. If you wanted, for instance, to make your code run on 25th December 2020 at midnight, you'd just change this to:

Code:
runtime=`/usr/bin/date -d '2020-12-25 00:00:00' +%s`

and you'd be all set.

--- Post updated at 03:51 PM ---

Hi,

Alternatively, if you wanted a more generic and less specific solution - e.g. a "run this at 14:50 every Friday" kind of situation, without worrying about an actual specific date in the year or specific second - you could do something along these lines:

Code:
#!/bin/bash

runday="Fri"
runhour="14"
runminute="50"

while true
do
        nowday=`/usr/bin/date +%a`
        nowhour=`/usr/bin/date +%H`
        nowminute=`/usr/bin/date +%M`

        if [ "$runday" == "$nowday" ] && [ "$runhour" == "$nowhour" ] && [ "$runminute" == "$nowminute" ]
        then
                date
                echo "It's time to run"
                exit 0
        else
                date
                echo "It's not time to run, I'll keep waiting"
        fi

        /usr/bin/sleep 60
done

This User Gave Thanks to drysdalk For This Post:
meister29
 

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LEARN ABOUT OPENSOLARIS

endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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