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How to insert a string in a file at specified place?

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# 1  
Old 01-15-2009
How to insert a string in a file at specified place?
Hi all,

I want to insert a string in a specified place of a very large file. I am giving an example of the task:

I love football.

Above is a sentence in a file and I want to insert a string "the" between love and football. It is not sure that where this particular line exists. It has to search these two strings and between two, it has to insert the defined string.

Thanks in advance!

Deepak
# 2  
Old 01-15-2009
Code:
string=whatever
awk -v insert="$string" '
/I love football/ { sub( "football", insert " football" ) }
 { print }
'

# 3  
Old 01-15-2009
string1="love football"
string2="love the football"
sed 's/'"$string1"'/'"$string2"'/g' filename
# 4  
Old 01-15-2009
Thanks for the quick and effective replies. Really appreciate .
# 5  
Old 01-15-2009
Code:
echo "I love football." | sed 's/\(.*love\) \(football.*\)/\1 the \2/'

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