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6

Many of the compressors take an an environment variable to accept options that cannot be passed on the command line. In your case GZIP_OPT=-9 sort --compress-program=/bin/gzip The same is true for xz with XZ_OPT and bzip2 with BZIP2


0

If you have e2fsprogs 1.42.9, then you can use e2image to create the partition image without the free space in the first place, so you can skip the zeroing step.


-2

You can use sfill. It's a better solution for thin volumes.



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