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/usr/share/doc/git/contrib/stats/git-common-hash
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#!/bin/sh # This script displays the distribution of longest common hash prefixes. # This can be used to determine the minimum prefix length to use # for object names to be unique. git rev-list --objects --all | sort | perl -lne ' substr($_, 40) = ""; # uncomment next line for a distribution of bits instead of hex chars # $_ = unpack("B*",pack("H*",$_)); if (defined $p) { ($p ^ $_) =~ /^(\0*)/; $common = length $1; if (defined $pcommon) { $count[$pcommon > $common ? $pcommon : $common]++; } else { $count[$common]++; # first item } } $p = $_; $pcommon = $common; END { $count[$common]++; # last item print "$_: $count[$_]" for 0..$#count; } '
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