How to remove all whitespaces from file

sed -r 's/\s+//g' filename.txt

cat filename.txt | tr -d " \t\r"

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

echo "Hello my name is Donald" | sed s/\ //g

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

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