bash - replace varying number of spaces in file with single space -

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i have list of files have columns separated varying number of spaces. how can sed or similar each column separated single space or tab?

i tried: 

 sed 's/ \+ /\t/g' file > tmp  sed "s/\ /\t/g" tmp > file

but r complained

line 526 did not have 11 elements

you use tr

tr -s < filename

or sed

sed -e 's/ \+/ /g' filename

inline sed

sed -i.bak -e 's/ \+/ /g' filename

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