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Re: 20050908: Avoiding certain products via pqact.conf

Leon,

> To: address@hidden
> From: Leon Minton <address@hidden>
> Subject: Avoiding certain products via pqact.conf
> Organization: Cooperative Institute for Mesoscale Meteorological Studies
> Keywords: 200509081733.j88HXljo021405

The above message contained the following:

> I have a couple of pqact.conf lines in which the value for \3 which is
> currently (...) needs to somehow eliminate the following combinations:
> 
> RRS, DPA, RCM, and possibly a few others. How would I modify the
> following lines to accomplish this??
> 
> WMO     ^(....[0-9][0-9]|....[0-9]) (K|T|P|N)(...)(.*)/p(....|.....|......)$
>         FILE    -strip  -overwrite      /home/ldm/data/\3/\5
> 
> # Text Only
> 
> WMO     ^(....[0-9][0-9]|....[0-9]) (K|T|P|N)(...)(.*)/p(....|.....|......)$
>         FILE    -strip  -overwrite      /home/ldm/current/\3\5

Excluding things by NOT matching on them can get very ugly very fast.
For example, an extended regular expression that matches everthing that
differs from "RRS", "DPA", and "RCM" by only one character is

    RR[^S]|R[^R]S|[^R]RS|DP[^A]|D[^P]A|[^D]PA|RC[^M]|R[^C]M|[^R]CM

Which still leaves differences by two, three, and all characters to
match upon.

A better solution would be to PIPE the data-products to a script that
only files the appropriate ones.  For example

    WMO
            ^(....[0-9][0-9]|....[0-9]) (K|T|P|N)(...)(.*)/p(....|.....|......)$
            PIPE
            -strip -close fileExceptRrsDpaRcm \3 \5

where the "fileExceptRrsDpaRcm" script could be

    if test $1 = RRS -o $1 = DPA -o $1 = RCM; then
        cat >/dev/null
    else
        cat >/home/ldm/data/$1/$2
    fi

Note that the script ALWAYS reads the data-product (as must all
decoders).

A good place to put the script is $LDMHOME/util -- assuming that
directory is in the PATH environment variable of the LDM user.

> Leon Minton, IT Analyst
> Cooperative Institute for Mesoscale Meteorological Studies
> Teamed with NWS-SRH-CWWD-DET (DOC/NOAA)

Regards,
Steve Emmerson

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