08-22-2005
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Friends,
I did following exercise
$ echo '' > test
$ od -b test
$ echo "">test
$ od -b test
$echo > test
$od -b test
Every time I got the following output
0000000 012
0000001
But 012 is octal value for new line character .
Even though there is no apperent new line character... (6 Replies)
Discussion started by: j1yant
6 Replies
2. UNIX for Dummies Questions & Answers
Ok what is BSD exactly? I know its a type of open source but what is it exactly? (1 Reply)
Discussion started by: Corrail
1 Replies
3. Programming
Hello. I'm a complete newbie to C programming. I have a C program that wasn't written by me where I need to write some wrappers around it to automate and make it easier for a client to use. The problem is that the program accepts standard input to control the program... I'm hoping to find a simple... (6 Replies)
Discussion started by: Xeed
6 Replies
4. UNIX for Dummies Questions & Answers
Hi Guys,
I've been learning UNIX for the past couple of days and I came across this exercise, I can't get my head around it, so I would be ever so grateful if I could receive some sort of help or direction with this.
Create a file with x amount of lines in it, the content of your choice. ... (3 Replies)
Discussion started by: aforball
3 Replies
5. Shell Programming and Scripting
i am doing ls -la
in the out put , first line is as
total 41621
What is this total? (2 Replies)
Discussion started by: Saurabh78
2 Replies
6. Shell Programming and Scripting
Hi,
Please don't berate me over the simplicity of these questions. I have recently gotten into bash shell scripting and enjoy it quite a bit. One thing I have not found the answer to though is when naming a shell script, what extension is normally used (ie myscript.?)? Also where is the standard... (5 Replies)
Discussion started by: msb65
5 Replies
7. UNIX for Dummies Questions & Answers
I had a script in solaris wich i read data, for example:
Number 1: _
and the cursor use to be in '_' place because in the code of the script i write:
echo "Number 1:\c"
but i copy the script to a linux and the cursor 'jump' to the begining of the next line like:
Number 1:... (2 Replies)
Discussion started by: lestat_ecuador
2 Replies
8. UNIX for Dummies Questions & Answers
hi everybody;
trying to c unix programming and ive stucked with a problem:
simple program
filedr=open("tempfile",O_RDWR|O_TRUNC,0);
write(filedr,msg1,6);
int i;
i=read(filedr,msg3,4);
it returns 0 bytes read ... why?
well if i try to poll() before read , it doesnt indicate POLLHUP or... (4 Replies)
Discussion started by: IdleProc
4 Replies
9. Shell Programming and Scripting
I am having trouble making this statement work. I am passing in a number value for the number of days to keep archive logs for and wanted to make sure that it is a number. I have a script that will return 1 for is a number and 0 for is not a number. I also want to make sure that the number is not... (2 Replies)
Discussion started by: gandolf989
2 Replies
10. Red Hat
Cheers!
In /etc/syslog.conf, if an error type is not specified, is it logged anywhere (most preferable is it logged to /var/log/messages) or not?
To be more precise I am interested in error and critical level messages. At default these errors are not specified in syslog.conf, and I need to... (6 Replies)
Discussion started by: dr1zzt3r
6 Replies
LEARN ABOUT DEBIAN
crypt::simple
Simple(3pm) User Contributed Perl Documentation Simple(3pm)
NAME
Crypt::Simple - encrypt stuff simply
SYNOPSIS
use Crypt::Simple;
my $data = encrypt(@stuff);
my @same_stuff = decrypt($data);
DESCRIPTION
Maybe you have a web application and you need to store some session data at the client side (in a cookie or hidden form fields) but you
don't want the user to be able to mess with the data. Maybe you want to save secret information to a text file. Maybe you have better
ideas of what to do with encrypted stuff!
This little module will convert all your data into nice base64 text that you can save in a text file, send in an email, store in a cookie
or web page, or bounce around the Net. The data you encrypt can be as simple or as complicated as you like.
KEY
If you don't pass any options when using "Crypt::Simple" we will generate a key for you based on the name of your module that uses this
one. In many cases this works fine, but you may want more control over the key. Here's how:
use Crypt::Simple passphrase => 'pass phrase';
The MD5 hash of the text string "pass phrase" is used as the key.
use Crypt::Simple prompt => 'Please type the magic words';
The user is prompted to enter a passphrase, and the MD5 hash of the entered text is used as the key.
use Crypt::Simple passfile => '/home/marty/secret';
The contents of the file /home/marty/secret are used as the pass phrase: the MD5 hash of the file is used as the key.
use Crypt::Simple file => '/home/marty/noise';
The contents of the file /home/marty/noise are directly used as the key.
INTERNALS
"Crypt::Simple" is really just a wrapper round a few other useful Perl modules: you may want to read the documentation for these modules
too.
We use "FreezeThaw" to squish all your data into a concise textual representation. We use "Compress::Zlib" to compress this string, and
then use "Crypt::Blowfish" in a home-brew CBC mode to perform the encryption. Somewhere in this process we also add a MD5 digest (using
"Digest::MD5"). Then we throw the whole thing through "MIME::Base64" to produce a nice bit of text for you to play with.
Decryption, obviously, is the reverse of this process.
WARNING
Governments throughout the world do not like encryption because it makes it difficult for them to look at all your stuff. Each country has
a different policy designed to stop you using encryption: some governments are honest enough to make it illegal; some think it is a
dangerous weapon; some insist that you are free to encrypt, but only evil people would want to; some make confusing and contradictory laws
because they try to do all of the above.
Although this modules itself does not include any encryption code, it does use another module that contains encryption code, and this
documentation mentions encryption. Downloading, using, or reading this modules could be illegal where you live.
AUTHOR
Marty Pauley <marty@kasei.com>
COPYRIGHT
Copyright (C) 2001 Kasei Limited
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License; either version 2 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.
perl v5.10.0 2002-09-23 Simple(3pm)