How to parse the string and get elements form it

input string: foo_20130612_15_25_46_bar01_02

expected output: 20130612

echo “foo_20130612_15_25_46_bar01_02” | awk -F’_’ ‘{print $2}’

echo “foo_20130612_15_25_46_bar01_02” | cut -d’_’ -f2

 

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