--exclude-compressed in environement variable

[Pascal76]

--exclude-compressed is not usable when using tar command for backups for ex.

tar cf $FILE.zst --use-compress-program zstd

Would be great to be able to ignore already compressed files in this case and probably other ones.

[Cyan4973]

Did you mean:

tar -cf $FILE.tar.zst -I 'zstd' .

[Pascal76]

sorry I don't understand your question.

-I = --use-compress-program also I did not added the directory to backup ... but that is not interesting

For zstd, --exclude-compressed should be the default value, from my point of view, for a compressor reputed for its velocity

[gcflymoto]

I disagree. Sometimes there is a benefit to double compressing so zstd should not be forcing --exclude-compressed on everyone. You can include it yourself

tar cf $FILE.zst --use-compress-program 'zstd --exclude-compressed'

[Pascal76]

ok some people may want double compressing, and for some cases too sometimes the compression is better.

Do you double compress zstd files too ?

Thank you for the command line.

[gcflymoto]

Not double .zst, but gzip+bzip2 or gzip+zstd can be a worthwhile combination

[lelik107]

I disagree. Sometimes there is a benefit to double compressing so zstd should not be forcing --exclude-compressed on everyone. You can include it yourself

tar cf $FILE.zst --use-compress-program 'zstd --exclude-compressed'

I totally agree - this option should not be enabled by default.