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Keep looking for file and search for a string

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# 1  
Old 11-30-2009
Keep looking for file and search for a string
Hi,
I need to a program tht will keep looking for that particular file and search for a string, if found kick of a process else exit with condition 1. Pls advice if this can be done by tail cmd or while looop.
# 2  
Old 11-30-2009
What OS are you on?
# 3  
Old 11-30-2009
I use Linux
# 4  
Old 11-30-2009
Suppose if you are looking inside file "/mylocation/myfile.log" for a particular string "Match Found", write a shell script as shown below and run it in background.

Code:
#!/bin/bash

my_file="/mylocation/myfile.log"
my_string="Match Found"

tail -F "$my_file" | while read line ; do
if test -n "$(echo "$line" | grep "$my_string")" ; then
echo "Match found!"
exit 0
else
exit 1
fi
done

meharo
# 5  
Old 11-30-2009
Something like
Code:
#!/bin/bash
if grep $string $file
then
    Kick
else
    exit 1
fi
exit 0

Sorry but i don't really understand what you mean by "kick of a process" or is it "kick off" ? If so the use kill or killall (depending on if you have the process ID or name)
# 6  
Old 11-30-2009
To kick off means to start...

I would suggest:
Code:
grep -q "$string" "$file"

Otherwise the output of grep will be visible on stdout. Also: use quotes as with out the the code will break if there are spaces or special characters in the strings.
Last edited by Scrutinizer; 11-30-2009 at 03:49 PM..
# 7  
Old 11-30-2009
Quote:
Originally Posted by zooby
Hi,
I need to a program tht will keep looking for that particular file and search for a string, if found kick of a process else exit with condition 1. Pls advice if this can be done by tail cmd or while looop.
This is confusing as you say you want the program to loop but also to exit if it does not find the matching string. You cannot loop and exit the script so what is it you are trying to do?
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