Introduction:

The -Sec5 option prints a short summary of Section 5, the Data Representation Section.

wgrib2 png.grb2 -Sec5
1:4:Sec5 len=21 #defined data points=65160 Data Repr. Template=5.41

len=21                       Section 5 is 21 octets/bytes in length
#defined data points=65160   Number of data points with values present in Section 7
Data Repr. Template=5.41     Data Represenation Template is 5.41

Usage

-Sec5