shred: fix random passes* #7830
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nickorlow
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* shred: fix random passes, update documentation, add test * shred: update tests
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closes #7809
On my system, the number of random passes (as determined by
shred -vn$x foo.txt |& grep random | wc -l) is not determined byx/10. While it's true that 25 is the tipping point at which all patterns are used, the pattern is unclear. I'll open a separate issue so I don't dump too much shell output here. For the purpose of this PR, I changed 3 + x/10 to (x/10).max(3) to get closer to GNU behavior.