10-15-2010
8 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I was just wondering if it would be alright to dual boot a machine with both UNIX using XTERM for the interface and windows 98 or if people consider this a bad idea? if you consider it bad do tell me some possible alternatives..also would it be better to get linux over pure unix? I'd like a visual... (8 Replies)
Discussion started by: PravusMentis
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2. Shell Programming and Scripting
Keeping in mind that I'm relatively comfortable with programming in general but very new to unix and korn/bourne shell scripts..
I'm using awk on a CSV file, and then performing calculations and operations on specific fields within specific records. The CSV file I'm working with has about 600... (2 Replies)
Discussion started by: yongho
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3. Shell Programming and Scripting
Hi All,
I have got an echo statement with "\c" in it to avoid getting into a newline. Ths script is using #!\bin\sh
Any idea what could make it to escape "\c" (4 Replies)
Discussion started by: asami
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4. Shell Programming and Scripting
txt file like this,
1 2 3 4456
a bb c d 3 f e
1 k 32 d m f e
123 m 2 k
every line contains 3 or more columns, all the columns are separated by space, and every column includes 1 to 3 character.
what I wanna do is deleting the first three columns, and keep the rest no matter how long... (7 Replies)
Discussion started by: fedora
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5. Linux
Hi all,
I am new to redhat/fedora linux.
In fedora linux 6,we created one file system(hda3 - /fs).
in this mount poing we were installed mounta vista os.
while booting we are getting below error messages.
1)
Booting 'mountaVisat(2.6.18_pro 500_pc_target-x86_586 smp)'
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Discussion started by: arjunreddy3
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6. Shell Programming and Scripting
Hi,
I have a shell script where a lot of the code is repeated. I wanted to make the code much more compact so I spoke to a guy and he suggested using arrays, like follows:
#!/bin/bash
readonly -a nginx=('nginx' '--prefix=/opt' '-j 4'
'http://nginx.org/download/nginx-1.2.2.tar.gz'
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Discussion started by: Spadez
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7. Solaris
Hello Experts,
I am performing performance tests on a few mysql select queries.
I use the following command to clear the memory disk caches.
sync && echo 3 | sudo tee /proc/sys/vm/drop_caches
I however see that the above command works on RHEL6 but doesn't work on Solaris 10.
I asked... (4 Replies)
Discussion started by: Anirudh Kumar
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8. IP Networking
Hello,
/proc/sys/net/ipv4/ip_local_port_range returns 32000 - 61000,
i have a client TCP and a Server TCP. i have used bind() only on the server, the port of socket client is given by the OS that's it ?
it retrieves this port from this range (/proc/sys/net/ipv4/ip_local_port_range) ?
... (5 Replies)
Discussion started by: chercheur111
5 Replies
LEARN ABOUT MINIX
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)