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echo "test_1.txt
test_2.txt
test_11.txt
test_12.txt
test_3.txt" | sort -t_ -nk2,2

Success #stdin #stdout 0.02s 5312KB

stdin

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Standard input is empty

stdout

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test_1.txt
test_2.txt
test_3.txt
test_11.txt
test_12.txt

https://ideone.com/scjYTH

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Bash (bash 5.0.3)

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