On 24/02/16 15:11, Josef Carnap wrote: > I have a question to the options --compress-level and > --bzip2-compress-level. Which are the supportet (possible) > values of each of the options? -- Numbers from 0 up to 6?
The canonical way to use the BZIP2 algorithm on Linux is through the bzip2 program. Its man page lists the following: > -1 (or --fast) to -9 (or --best) > Set the block size to 100 k, 200 k ... 900 k when > compressing. > Has no effect when decompressing. See MEMORY MANAGEMENT > below. > The --fast and --best aliases are primarily for GNU gzip > compati‐ > bility. In particular, --fast doesn't make things > significantly > faster. And --best merely selects the default behaviour. The other two require you to look a bit further than just lowercasing :), but I think they both use the DEFLATE compression method. On Linux, you will often use gzip to create archives with DEFLATE. Its man page says: > -# --fast --best > Regulate the speed of compression using the specified digit > #, > where -1 or --fast indicates the fastest compression method > (less > compression) and -9 or --best indicates the slowest > compression > method (best compression). The default compression level is > -6 > (that is, biased towards high compression at expense of speed). This does however raise a question: > Here is the description of the both options in the GPG Manual: > [...] > --bzip2-compress-level sets the compression level for the BZIP2 > compression algorithm (defaulting to 6 as well). This is a different > option from --compress-level since BZIP2 uses a significant amount of > memory for each additional compression level. The defaults are apparently different? HTH, Peter. -- I use the GNU Privacy Guard (GnuPG) in combination with Enigmail. You can send me encrypted mail if you want some privacy. My key is available at <http://digitalbrains.com/2012/openpgp-key-peter> _______________________________________________ Gnupg-users mailing list [email protected] http://lists.gnupg.org/mailman/listinfo/gnupg-users
