Shell script automation using cron which query's MySQL Tables Post: 303023678

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Top Forums Shell Programming and Scripting Shell script automation using cron which query's MySQL Tables Post 303023678 by Neo on Thursday 20th of September 2018 10:12:41 PM

09-20-2018

Administrator

First of all, your crontab entry does not schedule every 38 minutes:

Code:

38 * * * * /your/crontab/script.sh

That crontab entry executes at 38 minutes after the hour, every hour.

There are many examples of how to write a crontab entry in the man pages.

For example on linux:

https://www.unix.com/man-page/linux/5/crontab/

Quote:

EXAMPLE CRON FILE

Code:

# use /bin/bash to run commands, instead of the default /bin/sh
       SHELL=/bin/bash
       # mail any output to `paul', no matter whose crontab this is
       MAILTO=paul
       #
       # run five minutes after midnight, every day
       5 0 * * *       $HOME/bin/daily.job >> $HOME/tmp/out 2>&1
       # run at 2:15pm on the first of every month -- output mailed to paul
       15 14 1 * *     $HOME/bin/monthly
       # run at 10 pm on weekdays, annoy Joe
       0 22 * * 1-5    mail -s "It's 10pm" joe%Joe,%%Where are your kids?%
       23 0-23/2 * * * echo "run 23 minutes after midn, 2am, 4am ..., everyday"
       5 4 * * sun     echo "run at 5 after 4 every sunday"
       # Run on every second Saturday of the month
       0 4 8-14 * *    test $(date +%u) -eq 6 && echo "2nd Saturday"

Maybe you can review the examples and repost your idea for the correct crontab entry for us to review?

I am not the "kind of guy" to post solutions for people, as I prefer to lead people to learn to think and solve problems for themselves.

Quote:

SOAPBOX

If we just "give you the solution" then we are not teaching you to solve problems on your own; we are doing your work for you. We are here to teach and lead people to solutions, and to help them development themselves as unix/linux systems admins, developers, problem solvers and coders, not to do your work.

/SOAPBOX

Your reply describes a crontab entry that is different than your crontab entry.

Neo

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cron

CRON(8) 						      System Manager's Manual							   CRON(8)

NAME

       cron - daemon to execute scheduled commands (Vixie Cron)

SYNOPSIS

       cron

DESCRIPTION

       Cron should be started from /etc/rc or /etc/rc.local.  It will return immediately, so you don't need to start it with '&'.

       Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory.  Cron
       also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see  crontab(5)).	Cron  then
       wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute.  When execut-
       ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab,	if
       such exists).

       Additionally,  cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
       cron will then examine the modtime on all crontabs and reload those which have changed.	Thus cron need not be restarted whenever a crontab
       file is modified.  Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.

SEE ALSO

       crontab(1), crontab(5)

AUTHOR

       Paul Vixie <paul@vix.com>

4th Berkeley Distribution					 20 December 1993							   CRON(8)