Crontab in script


 
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# 1  
Old 11-27-2013
Crontab in script

I have crontab setup via crontab -e

I was wondering if its possible to create a cron job from a script so when the script is run the cron job is created?
# 2  
Old 11-27-2013
Yes, though you wouldn't edit it via crontab -e. You would do crontab -l > filename to save the current cron table into a file, edit/append the file as you please, then put the new one in with crontab < filename

Put some unmistakable identifier into the new line so that you can tell if its there already, as well as remove it just as easily if needed.

Code:
crontab -l > localfile
if ! grep ::00001:: localfile >/dev/null
then
        echo "* * * * * scriptfile.sh # ::00001::" >> localfile
        crontab < localfile
fi

# 3  
Old 11-27-2013
Quote:
Originally Posted by Corona688
Yes, though you wouldn't edit it via crontab -e. You would do crontab -l > filename to save the current cron table into a file, edit/append the file as you please, then put the new one in with crontab < filename

Put some unmistakable identifier into the new line so that you can tell if its there already, as well as remove it just as easily if needed.

Code:
crontab -l > localfile
if ! grep ::00001:: localfile >/dev/null
then
        echo "* * * * * scriptfile.sh # ::00001::" >> localfile
        crontab < localfile
fi

thanks i think thats what i'm after this is my current code in crontab -e i basically have genWebsite.sh which generaters startPage.html:

Code:
*/1 * * * * /home3/username/ssh/shellcw/genWebsite.sh > /home3/username/ssh/shellcw/startPage.html

how would i write this out implementing my command?
# 4  
Old 11-28-2013
Quote:
Originally Posted by scriptnewbie
Code:
*/1 * * * * /home...

Just an observation: this will only work on Linux-systems! If you work on one, fine, but if not: you will have to change this to the standard syntax:

Code:
0,1,2,3,4,5,6,....,58,59 * * * * /home...

I hope this helps.

bakunin
 
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