Currently I have a script that sets compression using the GZIP environment variable.
With gzip 1.8 I get a warning:
warning: GZIP environment variable is deprecated; use an alias or script
How should tar be invoked so the compression level be set?
Current command:
GZIP=-9 tar -zcf ... files to compress ...
You can specify the compression program using: -I / --use-compress-program=COMMAND.
So the original command:
GZIP=-9 tar -zcf ... files to compress ...
Becomes:
tar -I 'gzip -9' -cf ... files to compress ...