Replacing a word in a file, using C

Question

How do I replace a word in a file with another word using C?

For example, I have a file which contains:

my friend name is sajid

Answer 1

How about using the exiting Linux sed program?

sed -i 's/friend/grandfather/' filename

That will replace friend with grandfather in the existing file. Make a copy first if you want to keep the original!

Edit:

Alternatively, load the file into an STL string, replace 'friend' with 'grandfather' using a technique such as this, and save the new string into a file.