-p, --pattern PATTERN
Select the patterns to write. nnsa selects patterns compliant with NNSA Policy Letter NAP-14.1-C;
dod selects patterns compliant with DoD 5220.22-M; bsi selects patterns recommended by the German
Center of Security in Information Technologies (http://www.bsi.bund.de); old selects pre-version
1.7 scrub patterns; and fastold is old without the random pass. gutmann is a 35-pass sequence
described in Gutmann's paper cited below. See STANDARDS below for more detail. random is a
single random pass. random2 is two random passes. schneier is the method described by Bruce
Schneier in ''Applied Cryptography'' (1996) consisting of one 0x00 pass, one 0xff pass, and five
random passes. pfitzner7 is Roy Pfitzner's 7-random-pass method. pfitzner33 is Roy Pfitzner's
33-random-pass method. usarmy is the US Army AR380-19 method consisting of one 0x00 pass, one
0xff pass, and a random pass. Default: nnsa.
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