Convert a tab-delimited file to use newlines

I think your easiest way to do this is with tr:

tr '\t' '\n' < input.txt > output.txt

That'll turn all the tabs to newlines.

tr - Man Page

Sed:

sed -e 'y/\t/\n/' input.txt > output.txt

Awk:

awk 'BEGIN { OFS = "\n" } { $1=$1; print }' input.txt > output.txt

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