How to remove all white spaces from a given text file

Question

I want to remove all the white spaces from a given text file. Is there any shell command available for this ? Or, how to use sed for this purpose.

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Answer 1

This answer is similar to other however as some people have been complaining that the output goes to STDOUT i am just going to suggest redirecting it to the original file and overwriting it. I would never normally suggest this but sometimes quick and dirty works.

cat file.txt | tr -d " \t\n\r" > file.txt