Hi Patrick,
> I would normally have reached for diff(1) for a direct comparision
> between two files, out of familiarity.
diff(1) will do for comparing binary files, but GNU diff's heuristic for
determining if the files are binary can be misled so instead of the
normal ‘Binary files foo and bar differ’ one gets confusing output.
$ wc foo bar
993 3069 27568 foo
993 3069 27568 bar
1986 6138 55136 total
$
$ diff foo bar
993c993
< abcdef
---
> abcdef
$
$ diff foo bar | sed -n l
993c993$
< abc\000def$
---$
> abc\adef$
$
$ cmp -l foo bar
27564 0 7
$
> Thanks for cluing me in to b2sum.
It has a nice -l option for when a shorter digest is required.
$ for n in {3..9}; do
> b2sum -l $((2**n)) </dev/null
> done
2e -
b1fe -
1271cf25 -
e4a6a0577479b2b4 -
cae66941d9efbd404e4d88758ea67670 -
0e5751c026e543b2e8ab2eb06099daa1d1e5df47778f7787faab45cdf12fe3a8 -
786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce
-
$
--
Cheers, Ralph.
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