Get length of .wav from sox output

Question

I need to get the length of a .wav file.

Using:

sox output.wav -n stat 

Gives:

Samples read:            449718 Length (seconds):     28.107375 Scaled by:         2147483647.0 Maximum amplitude:     0.999969 Minimum amplitude:    -0.999969 Midline amplitude:     0.000000 Mean    norm:          0.145530 Mean    amplitude:     0.000291 RMS     amplitude:     0.249847 Maximum delta:         1.316925 Minimum delta:         0.000000 Mean    delta:         0.033336 RMS     delta:         0.064767 Rough   frequency:          660 Volume adjustment:        1.000 

How do I use grep or some other method to only output the value of the length in the second column, i.e. 28.107375?

Thanks

Answer 1

There is a better way:

soxi -D out.wav