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Old 11-01-2016, 03:28 AM   #1
kzo81
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Smile How to Cron a script from X pm to Y am in every Z min


Hi All,

Please, tell me how can I do this:
I have a download script, and I'd like to schedule it with cron.
I'd like to have it run from 19:00 till 05:00 in every 10 minutes.

Thanks

Zoli
 
Old 11-01-2016, 04:05 AM   #2
petelq
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You would amend you script to operate in a while ... next loop and include sleep 600 after the actual script and before the "next".
You can then install in your crontab for 19.00 everyday.
 
Old 11-01-2016, 05:10 AM   #3
Turbocapitalist
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Or you could just use a lot of commas in your crontab.
 
Old 11-01-2016, 06:24 AM   #4
michaelk
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You can use ranges. Lots of information on cron can be found like https://help.ubuntu.com/community/CronHowto

*/10 19-23,0-4 * * * /my/script

Last edited by michaelk; 11-01-2016 at 06:25 AM.
 
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Old 11-01-2016, 06:27 AM   #5
wpeckham
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I would add features to your script to detect if a copy is already running. If anything made it run long, or not exit, you could otherwise easily end up with MANY copies in memory running at the same time with inconvenient consequences.
 
Old 11-01-2016, 06:57 AM   #6
kzo81
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Quote:
Originally Posted by wpeckham View Post
I would add features to your script to detect if a copy is already running. If anything made it run long, or not exit, you could otherwise easily end up with MANY copies in memory running at the same time with inconvenient consequences.
I thought of that, thanks, this way they wont run into each other if 10 minutes was not enough for the downloading:


function no_multiple_instance(){

if [ "$(pgrep -x $(basename $0))" != "$$" ]; then
echo 'only one instance is allowed'
exit 1
fi
}
 
Old 11-01-2016, 06:58 AM   #7
kzo81
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Quote:
Originally Posted by michaelk View Post
You can use ranges. Lots of information on cron can be found like https://help.ubuntu.com/community/CronHowto

*/10 19-23,0-4 * * * /my/script
Thanks, if this works, I'll go with this one :-)
Sorry I don't like to rely on a while loop, and a break in it.
 
Old 11-01-2016, 06:59 AM   #8
Turbocapitalist
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"flock" is also another way of ensuring that only one instance is running at a time.
 
Old 11-01-2016, 07:02 AM   #9
kzo81
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in the meantime I was thinking of a function that exits early the scipt if it's not in the time interval, and have the script run repeatedly with cron...

but it's still buggy:

#!/bin/bash

FROM_HOUR=19
FROM_MIN=05

TO_HOUR=4
TO_MIN=05

let NOW=`date +%-H`+`date +%-M`
#let NOW=`date +%-M%-H`
let FROM=$FROM_HOUR+$FROM_MIN
let TO=$TO_HOUR+$TO_MIN


function checkTime(){
# exit early function if not in the time interval

if [ $FROM_HOUR -gt 23 ] || [ $TO_HOUR -gt 23 ] || [ $FROM_MIN -gt 59 ] || [ $TO_MIN -gt 59 ];then
echo "Specify hours in between 0-23 and minutes in between 0-59 !"
exit 1
fi

if [ $FROM -lt $NOW ] ;then
echo "before"
exit 1

fi

if [ $TO -gt $NOW ] ; then
echo "after"
exit 1
fi
}

checkTime

But do this with cron, even if it's a bit complicated is more sympathetic to me.

Last edited by kzo81; 11-01-2016 at 07:04 AM.
 
Old 11-01-2016, 07:12 AM   #10
kzo81
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Quote:
Originally Posted by Turbocapitalist View Post
"flock" is also another way of ensuring that only one instance is running at a time.
thx
 
Old 11-01-2016, 07:13 AM   #11
kzo81
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Quote:
Originally Posted by wpeckham View Post
I would add features to your script to detect if a copy is already running. If anything made it run long, or not exit, you could otherwise easily end up with MANY copies in memory running at the same time with inconvenient consequences.
thx, but I don't like a while loop with a break in my script.
 
Old 11-01-2016, 07:47 AM   #12
michaelk
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If a loop is written correctly there is no reason you can not rely upon it. bash does not automatically do time math and you would typically convert hours-minutes to seconds depending on your requirements.

Quote:
NOW=`date +%-H`+`date +%-M`
NOW=$( date +%-H%M )

By using the %-M you will remove any leading zeros which could lead to bad results.
 
Old 11-01-2016, 08:30 AM   #13
schneidz
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this date math mite be easier:
Quote:
Originally Posted by schneidz View Post
convert the dates to seconds then re-convert the output:
Code:
[schneidz@hyper tmp]$ date +%s -d 'Jun 17 02:00'
1466143200
[schneidz@hyper tmp]$ date -d '@1466143200'
Fri Jun 17 02:00:00 EDT 2016
 
Old 11-01-2016, 08:33 AM   #14
Habitual
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http://www.linuxquestions.org/questi...-month-524720/ offers clues, I think.

and some other notable hits with similar clues at
https://www.google.com/search?q=goog...rg%2Fquestions

Have fun!
Edit:
http://www.linuxquestions.org/questi...-a-4175511917/
seems like a better fit?

Last edited by Habitual; 11-01-2016 at 08:42 AM.
 
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Old 11-01-2016, 01:51 PM   #15
kzo81
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Quote:
Originally Posted by michaelk View Post
You can use ranges. Lots of information on cron can be found like https://help.ubuntu.com/community/CronHowto

*/10 19-23,0-4 * * * /my/script
That's great ! I didn't know about cron ranges, I'm testing it now, it seems rock solid for my script!
 
  


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