/Shell/Bash/How to find and replace a string in a file using shell script

How to find and replace a string in a file using shell script

# replaces ALL(g i.e. global) ouccurences of "original_string" with "new_string", 
# in the file file_name.ext_name
sed -i 's/original_string/new_string/g' file_name.ext_name

Source: askubuntu.com

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