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Check out this answer: How to check if sed has changed a fileHow to check if sed has changed a file.
sed
Its pretty much the same as you are asking, its suggesting you use awk or output to a different file and diff the two files.
awk
diff
Check out this answer: How to check if sed has changed a file.
Check out this awnseranswer:
how-to-check-if-sed-has-changed-a-fileHow to check if sed has changed a file.
Check out this awnser:
how-to-check-if-sed-has-changed-a-file