On Tue, Jul 07, 2009 at 12:08:05AM -0400, Scott Gifford wrote:
> Ron Johnson <ron.l.john...@cox.net> writes:
> You will need to figure out what metadata you care about and what you
> don't, then. For example, do you want to detect a renamed file? A
> change in mtime/ctime/utime? A change in permissions?
>
> For the file contents, if there are no subdirectories you can use:
>
> cat `ls` |sha1sum
Which is basically:
cat * | sha1sum
And it would still fail to detect the difference between:
case 1:
seq 1 6 >file1
case2:
seq 1 3 >file1
seq 4 6 >file2
(Same content, different metadata)
>
> ls will sort the files, so they will end up in the same order every
> time.
>
> For metadata, you could come up with the flags to ls that give the
> metadata you want, then include that before or after the cat, like
> this:
>
> (ls -l; cat `ls`) |sha1sum
Same comment about echo *.
Also note that packing files together with their metadata is, in fact,
exactly what an archive utility does:
tar cf - . | sha1sum
This will also pick hidden files and subdirectories.
Oh, and sha1sum is not the only checksum available:
$ ls /usr/bin/*sum
/usr/bin/cksum /usr/bin/lh_source_md5sum /usr/bin/sha384sum
/usr/bin/innochecksum /usr/bin/md5sum /usr/bin/sha512sum
/usr/bin/jacksum /usr/bin/sha1sum /usr/bin/shasum
/usr/bin/kmk_md5sum /usr/bin/sha224sum /usr/bin/sum
/usr/bin/lh_binary_md5sum /usr/bin/sha256sum
Some of those are actually relevant :-)
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