08-31-2006
10 More Discussions You Might Find Interesting
1. Cybersecurity
restricted access...
Hi
I need to restrict users shell access to only $HOME under /home for each user. I don't want them getting out of their own directories. From what I understand chroot is something I could use, but I want to avoid this since it involves creating symbolic links to a number... (9 Replies)
Discussion started by: alwayslearningunix
9 Replies
2. UNIX for Dummies Questions & Answers
I need to create a user that only has access to 1 directory (e.g. /vol/mita/test). The user needs to be able to rsh into that directory to run a script. The user should not be able to navigate to any other directories above /vol/mita/test. Any help would be appreciated! (4 Replies)
Discussion started by: ngagne
4 Replies
3. Cybersecurity
Hi
I want to to restrict root login on a redhat box from the terminal only. I read I need to comment out everything from /etc/securetty file except tty1 through tty11. There are some entries in the file that I do not u/stand, i.e. vc/1 through vc/11. What are these entries? Where do these... (2 Replies)
Discussion started by: skotapal
2 Replies
4. Solaris
Hi All,
I'm on Solaris 8, I need to provide Read-only access to a user to 2 directories only.
Using rsh (restricted shell) as the user's login shell, I can restrict the user's access to a certain directory only, but how can I set in such a way that the user can access only the 2 directories... (4 Replies)
Discussion started by: max_min
4 Replies
5. Solaris
We want to secure access to a server by restricting the number of users who can login to it. Our users are NIS users. Only few of them can telnet/ssh this server.
Do you have any idea on how to implement that?
thanks. (1 Reply)
Discussion started by: melanie_pfefer
1 Replies
6. UNIX for Dummies Questions & Answers
Hi all,
I have user called "Z". The home directory is /home/Z. I have another directory /home/Z/OP. Within /home/Z/OP, i have 2 directories
/home/Z/OP/OP1 and /home/Z/OP2.
I want to restrict access for Z to only access
/home/Z/OP and
/home/Z/OP1 and
/home/Z/OP2.
What kind of... (4 Replies)
Discussion started by: new2ss
4 Replies
7. UNIX for Advanced & Expert Users
Hi All,
I am facing a problem, regarding code security on a server.
We have configured a server which contains our code (ear present in jboss/server/xyz/deploy) in it, and need to bind the code to the server itself so that no one can take the code out of the. the problem is that the password of... (3 Replies)
Discussion started by: akshay61286
3 Replies
8. Solaris
Dear All,
I have created a user called "x" who is allowed only to FTP and it is working fine. Here my problem is, I want to give access to a particular directory say for eg:- /dump/test directory. I don't find any option in the useradd command to restrict access to this particular directory only... (1 Reply)
Discussion started by: Vijayakumarpc
1 Replies
9. UNIX for Dummies Questions & Answers
Hello,
I am using MySecureShell to chroot all sftp accesses. The problem that I have is that my boss does not want root to be able to use sftp. Root should still be able to ssh. Any ideas? (2 Replies)
Discussion started by: mojoman
2 Replies
10. Solaris
Dear all,
I am administering a DC environment of over 100+ Solaris servers used by various teams including Databases.
Every user created on the node belonging to databases is assigned group staff(10) .
I want that all users belonging to staff should NOT be able to execute certain system... (6 Replies)
Discussion started by: Junaid Subhani
6 Replies
LEARN ABOUT DEBIAN
pbmreduce
pbmreduce(1) General Commands Manual pbmreduce(1)
NAME
pbmreduce - read a portable bitmap and reduce it N times
SYNOPSIS
pbmreduce [-floyd|-fs|-threshold ] [-value val] N [pbmfile]
DESCRIPTION
Reads a portable bitmap as input. Reduces it by a factor of N, and produces a portable bitmap as output.
pbmreduce duplicates a lot of the functionality of pgmtopbm; you could do something like pnmscale | pgmtopbm, but pbmreduce is a lot
faster.
pbmreduce can be used to "re-halftone" an image. Let's say you have a scanner that only produces black&white, not grayscale, and it does a
terrible job of halftoning (most b&w scanners fit this description). One way to fix the halftoning is to scan at the highest possible res-
olution, say 300 dpi, and then reduce by a factor of three or so using pbmreduce. You can even correct the brightness of an image, by
using the -value flag.
OPTIONS
By default, the halftoning after the reduction is done via boustrophedonic Floyd-Steinberg error diffusion; however, the -threshold flag
can be used to specify simple thresholding. This gives better results when reducing line drawings.
The -value flag alters the thresholding value for all quantizations. It should be a real number between 0 and 1. Above 0.5 means darker
images; below 0.5 means lighter.
All flags can be abbreviated to their shortest unique prefix.
SEE ALSO
pnmenlarge(1), pnmscale(1), pgmtopbm(1), pbm(5)
AUTHOR
Copyright (C) 1988 by Jef Poskanzer.
02 August 1989 pbmreduce(1)