"gzip *" will do what you want.
When it encounters something that's already gzip'd, it will skip it,
but will emit a warning that it's doing so.
Otherwise, you could use something like:
find -X . \! -name "*.tar.gz" -type f -maxdepth 1 | xargs gzip
i don't understand the difference.
.tar.gz files are already gzip'd :), so no need for second case. it will
be skipped anyway
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