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sed -i option example

 
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# 1  
Old 06-22-2011
Bug sed -i option example
Can anyone give detailed and example for sed -i option.
Where can we use this option?Smilie
# 2  
Old 06-22-2011
sed -i is used to make the changes to a original file

see the below example

Code:
 
bash-3.00$ echo "abc" > test.txt

bash-3.00$ sed 's/abc/efg/' test.txt
efg

bash-3.00$ cat test.txt
abc

bash-3.00$ sed -i 's/abc/efg/' test.txt

bash-3.00$ cat test.txt
efg

# 3  
Old 06-22-2011
-i option stands for "in-place" editing. It is used to modify the file without the need to save the output of sed command to some temporary file and then replacing the original file. For example instead of:
Code:
sed 's/a/b/g' file > file.tmp; mv file.tmp file

you can do:
Code:
sed -i 's/a/b/g' file

# 4  
Old 06-22-2011
thanks itkamaraj and bartus11... i understood....
 
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