With GNU GZIP environment variable deprecated, how to control ZLIB compression via tar? -


currently have script sets compression using gzip environment variable.

with gzip 1.8 warning:

warning: gzip environment variable deprecated; use alias or script

how should tar invoked compression level set?

current command:

gzip=-9 tar -zcf ... files compress ...

depends on os, , version of tar ships it. if it's bsd and/or macos, can just:

tar --options gzip:compression-level=9 -czf foo.tar.gz foo.txt

otherwise, take compression stage own hands:

tar -cf - foo.txt | gzip -9 > foo.tar.gz

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