Meet the world's most advanced operating system. Again. Instantly find what you're looking for. Get information in an instant with a single click. Mac OS X Tiger delivers 200+ new features which make it easier than ever to find, access and enjoy everything on your computer.
From a rock-solid, developer-friendly UNIX foundation to grid computing, powerful technologies drive Mac OS X Tiger to its leadership role as the world's most advanced operating system.
Hello,
Over the past few years, I've conducted some rather thorough R&D in the field of lexicon-data-structure optimization.
A Trie is a good place to start, followed by a traditional DAWG.
Smaller means faster, but a traditional DAWG encoding operates as a Boolean-graph, unable to index... (1 Reply)
Hey, I am basically a newb when it comes to anything other than gaming on computers. I am working on changing that and as a first step am installing and learning a UNIX system on my mac. Here is the thing. I already partitioned the hard drive using boot camp to install windows, which I... (6 Replies)
Are Mac OS X 10.4.11 Tiger passwords only stored in /var/db/shadow/hash? Or is it also used in NetInfo?
The reason I am asking is because I wonder if I edit the file in /var/db/shadow/hash and replace the hash inside with my own, will it change the password?
Thanks. (0 Replies)
I was installing gdm on the terminal application and my ISP disconnected. When I reconnected and tried to continue the installation, I got the following message:
Waiting for lock on... (0 Replies)
Question:
Can I run a UNIX executable on Mac OS X Tiger?
If so, how is it done?
Background:
I FTP'd my schools UNIX server some C++ code and header files. Then I used Telnet to get g++ to compile them.
I then FTP'd the UNIX executable back to my PowerBook G4.
I've already... (4 Replies)
TTHSUM(1) GNU/Linux TTHSUM(1)NAME
tthsum - generates or checks TTH message digests
SYNOPSIS
tthsum [-bhmpvVw] [-c [file]] | [file...]
DESCRIPTION
tthsum generates or checks TTH checksums (roots of the Tiger/THEX hash tree). The Merkle Hash Tree, invented by Ralph Merkle, is a hash
construct that exhibits desirable properties for verifying the integrity of files and file subranges in an incremental or out-of-order
fashion. tthsum uses the Tiger hash algorithm, by Ross Anderson and Eli Biham, for both the internal and the leaf nodes.
The specification of the THEX algorithm is at:
. http://www.open-content.net/specs/draft-jchapweske-thex-02.html
The specification of the Tiger hash algorithm is at:
. http://www.cs.technion.ac.il/~biham/Reports/Tiger/
Normally tthsum generates checksums of all files given to it as parameters and prints the checksums followed by the filenames. If, however,
-c is specified, only one filename parameter is allowed. This file should contain checksums and filenames to which these checksums refer,
and the files listed in that file are checked against the checksums listed there. See option -c for more information.
If no file is specified data will be read from standard input.
OPTIONS
-b An md5sum compatibility option. It does absolutely nothing. (md5sum uses -b to treat binary files differently from texts files.)
-c Check tthsum of all files listed in file against the checksum listed in the same file. The actual format of that file is the same as
output of tthsum. That is, each line in the file describes a file. A line looks like:
<TTH CHECKSUM> <FILENAME>
So, for example, if a file were created and its message digest calculated like so:
echo foo > tth-test-file; tthsum tth-test-file
tthsum would report:
A2MPPCGS5CPJV6AOAP37ICDCFV3WYU7PBREC6FY tth-test-file
See NOTES for more information on the digest file format.
-m Use mmap(2) instead of read(2) to read the contents of the files to hash. Normally, using read is cheaper. This all depends on sys-
tem load, I/O speed, CPU speed, L1 and/or L2 cache size and whatnot.
-p Show the progress. Print (<COMPLETED>/<TOTAL>) every 10 MiB on standard error while hashing. The numbers are in MiB.
-v Be verbose. Print filenames when checking (with -c).
-w Warn on improperly formatted lines when checking (with -c).
-h, -V Print a small help text or the version, respectively, on standard out. If an unknown combination of options is encountered, the
small help is printed on standard error and tthsum will return non-zero.
NOTES
tthsum intentionally uses an interface identical to md5sum.
tthsum uses BASE32 encoding consisting of the following characters: ABCDEFGHIJKLMNOPQRSTUVWXYZ234567. It will accept lower case letters in
the digest input as well.
tthsum does not accept long options such as --help.
A digest file format line looks like: <BASE32><SPACES><FILENAME><EOL>. BASE32 is a 39 character long BASE32 encoded string. SPACES is a
set of two spaces (0x20). FILENAME is the name of the file, encoded in UTF8 and with all control characters (those below 0x20) encoded as
xNN or C C-style escapes. (The backslash is escaped as \ as well. On Windows, backslashes in paths will be translated to slashes for
compatibility with real operating systems.) EOL may be CRLF (
), just plain LF (
) or even nothing at end-of-file.
If you see warnings about an improper locale setup, check your LANG and/or LC_CTYPE environment variables. If these are not set properly,
tthsum cannot represent non-ASCII characters (those above 0x7F) in UTF8. See locale(1) for more information or try to set LC_CTYPE to e.g.
"en_US".
AUTHOR
tthsum and this manpage were written by Walter Doekes (walter@djcvt.net). The hashing code was copied directly from DC++, an open source
peer-to-peer file sharing program by Jacek Sieka (jacek@creatio.se) who had based the hashing code on the one used in BCDC++ (a modified
DC++) by Dustin Brody (blackclaw@parsoma.net). After version 1.1.0, the hashing code from the Tiger hash authors is used instead, to sup-
port big endian architectures and to remove the need for C++ compilers and libraries. The md5sum manpage, written by Juho Vuori
(javuori@cc.helsinki.fi), was used as a template. This manpage was proofread by Dustin Brody.
RETURN VALUE
tthsum returns 0 if no error occurred or, when checking a digest, if at least one line is formatted properly and the TTHs of all properly
formatted lines match. tthsum returns 2 if an unknown combination of options is encountered. In all other cases will tthsum return 1.
SEE ALSO cksfv(1), md5sum(1), sha1sum(1)Walter Doekes 28th June 2005 TTHSUM(1)
