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I want to use the command line join utility on two files. Unfortunately, they're gzipped. Because they're both gzipped, I can't use gzip -cd. Is there a slick way to do this without having to unzip them?

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up vote 2 down vote accepted

No, but bash (among other shells) can do process substitution.

join <(zcat foo.gz) <(zcat bar.gz)
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It is documented in man page of gzip. You can use something like:

zcat a.gz b.gz | gzip -c > c.txt.gz
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