How to get actual probability values in libsvm svm-predict

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C++

Hi, iam using libsvm and when i use svm-predict to predict my trained dataset with testing model it gives the output as 1 or -1.
EX :
i use following cmd command

svm-predict Test.scale A.scale.model ATestData.txt

in the output file ATestData.txt it has -1 or 1

but i want to get the matching probability as a float value..Thanks in advance

ex : 0.5898 (a float value)