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

I think you may use sed to wipe out the space while not losing some infomation like changing to another line.

cat hello.txt | sed '/^$/d;s/[[:blank:]]//g'