[Gllug] Combining CAT and ZCAT in one line

[Andrew Black]

I have a number of logs, some of which have been compressed
   mainlog    mainlog.1   mainlog.2.gz   mainlog.3.gz

I can do
    cat mainlog       | grep oojimaflip
    zcat mainlog.*.qz | grep oojimaflip

Is there are way I can do both in the same line - decompress files that 
need it  on the fly ?
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