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need help in greping

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# 1  
Old 03-15-2010
need help in greping


i have to find a string in a file and positin of the string in the file would come in some particular interval.

let's say file is 1-1000 lines and string is in from 200-300line.
could any one suggest me how to get make the grep search for the string in that particular portion of the file and leave the rest.

And the file is a log file, so it is constantly changes(no. of lines)
# 2  
Old 03-15-2010
Tools using head, tail, grep

head -300 infile | tail -100 | grep "search text"

# 3  
Old 03-15-2010
Or, if you know lines before and after the ones you are looking for, you could do something like:

cat file | awk '/start string/,/end string/' | grep "search text"
# 4  
Old 03-15-2010
Or this:

awk 'NR > 200 && NR < 300 && /search text/' file.txt

# 5  
Old 03-15-2010
sed -n "200,300{/string/p;}" file

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