On Wed, Sep 12, 2012 at 02:11:05PM -0400, Karl Vogel wrote:
> >> On Tue, 11 Sep 2012 14:38:04 -0700, Gary Kline wrote:
> 
> G> I'm trying to checksum directories as I move them around.  ive read the
> G> man page for sum and cksum ... or maybe skimmed them.  no joy.  anybody
> G> know of a utility to do this?  I've got files that are decades old...
> 
>    I wouldn't use CRC32 to check file integrity; use SHA1 or MD5 at the
>    very least.  See http://home.comcast.net/~bretm/hash/8.html for details.


[root@ethos klinebak]# yum install sha1
Loaded plugins: langpacks, presto, refresh-packagekit
adobe-linux-x86_64                                       |  951 B     00:00     
rpmfusion-free-updates                                   | 3.3 kB     00:00     
rpmfusion-nonfree-updates                                | 3.3 kB     00:00     
updates/metalink                                         |  18 kB     00:00     
No package sha1 available.
Error: Nothing to do
[root@ethos klinebak]# 

        see, nothing; I tried to install sha256 as  well. zip.  but md5sum
        I have, so that will serve.

> 
> >> On Tue, 11 Sep 2012 18:17:25 -0700, 
> >> Colin Barnabas <colin.barna...@gmail.com> replied:
> 
>    Are you by any chance a "Dark Shadows" fan?


        I havent a clue what that is; if it's a tv show, no.  
        same w/ movies.

> 
> C> This works for me:
> C> $ find foo/ -type f -print0 | xargs -0 md5 >> foo.md5
> 
>    I do something similar when copying files to a backup server; it's not
>    unheard of for SSH to drop a session or a drive to have a bad spot.
> 
>    An easy-to-automate way is: get a list of files, use the hash of your
>    choice to generate signatures, sort the signature file by the hash, and
>    then get the hash value of the signature file.  Here's an example using
>    my bin directory:
> 
>      me% ls
>      aline       dir         hist        makecfg     mx          ro
>      authlog     diskused    isodate     makekey     mylook      setperm
>      avg         dline       kernlog     makepass    n32         sha
>      buildenv    dnslog      lastdom     mb          n64         sshlog
>      cline       dosrc       linkdups    md5path     nr          sulog
>      cmdlog      dot         ll          memuse      ntplog      syslog
>      conlog      dp          lsl         mgrep       pathinfo    tc
>      core        f           lslm        mk          ping        tcv
>      cronlog     fixhist     lsn         mkdtree     plog        tl
>      daemonlog   fmt         lsnm        mkproto     pwgen       tr0
>      dblog       getperm     lss         mkrcs       r           tx
>      dbrun       google      lssm        mongolog    rand        vi
>      dh          haval       lst         month       range       zp
>      dig         help2man    lstm        mv2inode
>      
>      me% find . -type f -print0 | xargs -0 md5 -r | sort > /tmp/dir.md5
>      
>      me% cat /tmp/dir.md5
>      01328aeb4fd0eb3d998f4d7ad407a73f ./setperm
>      017d6d622fb93bf7f23c0fb7b96b16eb ./core
>      0287839688bd660676582266685b05bd ./mkrcs
>      0b97494883c76da546e3603d1b65e7b2 ./pwgen
>      ...
>      ddbed53e795724e4a6683e7b0987284c ./authlog
>      ddbed53e795724e4a6683e7b0987284c ./cmdlog
>      ddbed53e795724e4a6683e7b0987284c ./conlog
>      ddbed53e795724e4a6683e7b0987284c ./cronlog
>      ddbed53e795724e4a6683e7b0987284c ./daemonlog
>      ddbed53e795724e4a6683e7b0987284c ./kernlog
>      ddbed53e795724e4a6683e7b0987284c ./ntplog
>      ddbed53e795724e4a6683e7b0987284c ./sulog
>      ddbed53e795724e4a6683e7b0987284c ./syslog
>      ...
>      fdff1fd84d47f76dbd4954c607d66714 ./dbrun
>      ff5e24efec5cf1e17cf32c58e9c4b317 ./tr0
> 
>    The *log files are hard-linked, hence the duplicate MD5 values.
>      

        right.


>      me% md5 -r /tmp/dir.md5
>      fdc34a5a5df7807d4fc45739d2d3039f /tmp/dir.md5
> 
>    If I copy these files elsewhere, I can repeat the steps and just compare
>    the final hash; if it's anything other than 'fdc34...3039f', something's
>    wrong.


        well, the full story is my new system admin left my desktop 3/4 or 7/8
        or 15/16ths in shardes.  I have to-be-made-whole files/dirs in
        /home/kline.  copies from two primary computers are scattered all
        over.  I/  it won't be the-end if I lose a few favorite songs, but 
        I  wantto make certain that my devel and journal and writing dirs 
        and a few others are md5sum flawless.     

        thanks for youw howto across machines, karl.  I'll save this in my
        howto file.  my present desktop is temp; I'll turn it into a server
        ---just-in-case.  then will use my server for backups.  gotta 
        match up.

> 
> -- 
> Karl Vogel                      I don't speak for the USAF or my company
> 
> When In Doubt, Empty The Magazine    --bumper-sticker seen on military base
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