/usr/share/eccodes/definitions/mars/grib.mnth.4v.def is in libeccodes-data 2.0.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # assert(local=1)
meta verificationDate g1verificationdate(dataDate, dataTime, endStep) : read_only;
meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
alias mars.date = monthlyVerificationDate;
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