Hi,
I need to generate a listing of files that have been changed since x day. the listing is to be sorted by date.
I managed to get the 1st requirement using the find command :
find . -mtime -100 -type f -ls
but I don't know how to sort the ls listing by date. :(
The challenge comes... (4 Replies)
Hello everyone. I am new to these forums and also new to Unix. And by saying "new to Unix" I mean I have never used it and 10 minutes ago was asked to start learning. So here I am.
I was wondering if anyone could help me find out how long it would take to write code in Unix that will do the... (1 Reply)
Hi, there are some servers here at work which issue a Safeword challenge after I login. Can anyone tell me exactly how the challenge/response system works? In particular, how are the valid keys decided? (2 Replies)
Here's a challenge for you wizards...
I have a file formatted as follows;
$
What I need to output is;
87654321 Bobby One
12345678 Bobby One
09876543 Bobby One
1107338 Bobby! Two
Any Ideas how I can do this? I've tried sed but I'm not sure if perl might be a better way to... (2 Replies)
Here's a regex substitution operation that has stumped me with sed:
How do you convert lines like this:
first.key ?{x.y.z}
second.key ?{xa.ys.zz.s}
third.key ?{xa.k}
to:
first.key ?{x_y_z}
second.key ?{xa_ys_zz_s}
third.key ?{xa_k}
So i'm basically converting all the... (11 Replies)
Hi everybody, I'm new to these forums and this is my first post. A couple days ago I was trying to find a simple script that would return an individual's local weather conditions using I.P. based geolocation. After many failed search attempts, I began my quest to create this for myself. I have to... (0 Replies)
Ok then i Have a challenge for you :
Give me PS1 so that it always display the least 2 levels of directory
(except if i am above of course)
I want it this way :
so if i go to
/
/home/
/home/user
/home/user/whatever
/home/user/whatever1/whatever2
my PS1 should respectively... (12 Replies)
I've been given a directory full of subdirectories full of logfiles of the same name:
/logfiles/day1/file1/blockednodes.csv
day1-14
file1-48
The above is the actual directory structure for 14 days worth of a logfile that is generated every 30 minutes. It's been done this way to preserve the... (15 Replies)
I have a log with entries like:
out/target/product/imx53_smd/obj/STATIC_LIBRARIES/libwebcore_intermediates/Source/WebCore/bindings/V8HTMLVideoElement.cpp
: target thumb C++: libwebcore <=... (8 Replies)
I have searched through google, and this forum to try and find the answer, but alas, nothing quite hits the whole answer.
I am trying to read the last line (or lines) of some log files. I do this often.
The files are named sequentially, using the date as part of the file name, and appending... (18 Replies)
Discussion started by: BatterBits
18 Replies
LEARN ABOUT CENTOS
userdbpw
USERDBPW(8) Double Precision, Inc. USERDBPW(8)NAME
userdbpw - create an encrypted password
SYNOPSIS
userdbpw [[-md5] | [-hmac-md5] | [-hmac-sha1]] |userdb {name} set {field}
DESCRIPTION
userdbpw enables secure entry of encrypted passwords into /etc/courier/userdb.
userdbpw reads a single line of text on standard input, encrypts it, and prints the encrypted result to standard output.
If standard input is attached to a terminal device, userdbpw explicitly issues a "Password: " prompt on standard error, and turns off echo
while the password is entered.
The -md5 option is available on systems that use MD5-hashed passwords (such as systems that use the current version of the PAM library for
authenticating, with MD5 passwords enabled). This option creates an MD5 password hash, instead of using the traditional crypt() function.
-hmac-md5 and -hmac-sha1 options are available only if the userdb library is installed by an application that uses a challenge/response
authentication mechanism. -hmac-md5 creates an intermediate HMAC context using the MD5 hash function. -hmac-sha1 uses the SHA1 hash
function instead. Whether either HMAC function is actually available depends on the actual application that installs the userdb library.
Note that even though the result of HMAC hashing looks like an encrypted password, it's really not. HMAC-based challenge/response
authentication mechanisms require the cleartext password to be available as cleartext. Computing an intermediate HMAC context does scramble
the cleartext password, however if its compromised, it WILL be possible for an attacker to succesfully authenticate. Therefore,
applications that use challenge/response authentication will store intermediate HMAC contexts in the "pw" fields in the userdb database,
which will be compiled into the userdbshadow.dat database, which has group and world permissions turned off. The userdb library also
requires that the cleartext userdb source for the userdb.dat and userdbshadow.dat databases is also stored with the group and world
permissions turned off.
userdbpw is usually used together in a pipe with userdb, which reads from standard input. For example:
userdbpw -md5 | userdb users/john set systempw
or:
userdbpw -hmac-md5 | userdb users/john set hmac-md5pw
These commands set the systempw field in the record for the user john in /etc/courier/userdb/users file, and the hmac-md5pw field. Don't
forget to run makeuserdb for the change to take effect.
The following command does the same thing:
userdb users/john set systempw=SECRETPASSWORD
However, this command passes the secret password as an argument to the userdb command, which can be viewed by anyone who happens to run
ps(1) at the same time. Using userdbpw allows the secret password to be specified in a way that cannot be easily viewed by ps(1).
SEE ALSO userdb(8)[1], makeuserdb(8)[2]
NOTES
1. userdb(8)
userdb.html
2. makeuserdb(8)
makeuserdb.html
Double Precision, Inc. 08/23/2008 USERDBPW(8)