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How to end tail -f from the script?

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# 1  
Old 07-28-2014
How to end tail -f from the script?
Hi,

i have a script


Code:
tail -f logs| grep item

i need to end the script once it finds item in the logs folder, this happens on run time.
# 2  
Old 07-28-2014
If you want to stop the execution of the script when a certain "item" is logged to logs file, instead of using tail, you could try this:
Code:
while true; do
    grep -q item logs && echo "Event \"item\" occurred"; exit 0
    sleep 5
done

# 3  
Old 07-28-2014
Chacko ,

Thanks for the solution

it din't worked, but i found the alternate for the same

Code:
tail -f logs | awk '/item/;/item/ { exit }'

# 4  
Old 07-28-2014
Sorry my mistake, it should have been,
Code:
grep -q item logs && (echo "Event \"item\" occurred"; exit 0)

# 5  
Old 07-29-2014
Quote:
Originally Posted by nikhil jain
Chacko ,

Thanks for the solution

it din't worked, but i found the alternate for the same

Code:
tail -f logs | awk '/item/;/item/ { exit }'


Hello,

Could you explain what does the ; do in awk?

I know that between / / is to find an item.

Thanks.
# 6  
Old 07-29-2014
It separates two independent statements.

The first /item/, by itself, means 'print lines matching "item"'. It defaults to print when no other statement is given. The second one, which has a code block after, means 'quit when a line matches "item"'.
This User Gave Thanks to Corona688 For This Post:
Kibou
# 7  
Old 07-29-2014
It looks similar to ,
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