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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

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /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/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, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)
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