gzip - Input output redirection UNIX -

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say have file called package.tar.gz do: cat package.tar.gz | gzip -d | tar tvf - , shows me list of files in tar archive.

however if do: gzip -d package.tar.gz | tar tvf - says tar: not tar archive

i don't understand why is. if result of gzip -d in first case returns output can interpreted tar archive, why won't work in second case?

i have seen autotools - tar not tar archive i'm not convinced it's issue tar in case since first command works...

it looks me you're not passing -d option in second case. manpage,

compressed files can restored original form using gzip -d or gunzip or zcat.

what's appropriate style zcat sounds - gunzip + cat.


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