Introduction

The -match option selects records which should be processed. When multiple -match options are used, all matches must be satisfied. The -match and -not options seem to be similar to the -if and -if_not options. The big difference is that the -match and -not options are processed before any other record processing. If the record satisfies the -match and -not options, then the record is processed. This include the optional decoding and latitude-longitude calculation and the other options.

    wgrib2 -match X (...)

is the same as 

    wgrib2 -match_inv file | egrep X | wgrib2 -i (...)



    wgrib2 -match X -match Y -not Z (...)

is the same as 

    wgrib2 -match_inv file | egrep X | egrep Y | egrep -v Z | wgrib2 -i (...)

where X, Y and Z are regular expressions. 

Usage

-match X

X is a posix extended regular expression

The -match, and -not selection facility is more limited than the "wgrib2 | filter | wgrib2 -i" syntax. However, it can be more efficient especially when combined with the -end option. Note that the "match" inventory often expands. Usually the inventory expands by adding new items to the end of the inventory in order not the break scripts.

See also: -not, -match_inv, -end, -i. -if.