sed command replace string in file code example
Example 1: sed replace in file
sed -i 's/foo/bar/g' hello.txt
Example 2: sed replace all occurances?
echo dog dog dos | sed -e 's:dog:log:g'
#You can also use the above answer with appropriate slashes like
echo "grepper is a nice grepper" | sed "s/grepper/blow/g"