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sed is a command line tool to transform text.
Starting with sed
The official documentation for GNU sed is not very beginner friendly.
Yet, it is very easy to get started with sed. The command:
$ sed 's/apple/banana/' file.txt
will change the first occurrence on each line of 'apple' to 'banana'.
Adding the operator 'g' (for 'global') will change all occurrences:
$ sed 's/apple/banana/g' file.txt
With the option --in-place, the file itself will be changed, instead of the result being simply output to the console:
$ sed --in-place 's/apple/banana/g' file.txt
See sub-wiki page below.