03-26-2012
4 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I am trying to list names of only today's files OR say, files which are not older than 1 hour and copy them in 'list.txt' file. I know,
:ls > list.txt will list all the files. But, how to list today's files? Any help will be appriciated. (4 Replies)
Discussion started by: berlin_germany
4 Replies
2. Shell Programming and Scripting
Hi,
I have some log files. I've been asked to grep out error messages that have happened ONLY today. (However, the logs keep messages a long time so they have error messages going back weeks)
They log details in these fields (order):
Month Day Time Server message
I can grep out the... (8 Replies)
Discussion started by: horhif
8 Replies
3. What is on Your Mind?
Scrutinizer and i had a discussion about loops in shell scripts and you might be interested in joining in and share your experiences:
i wrote an example script which basically employed the following logic:
cat /some/file | while read var ; do
echo var = $var # just do... (8 Replies)
Discussion started by: bakunin
8 Replies
4. Shell Programming and Scripting
hello,
in a file exist entries in date format YYYYMMDD. i want to find out, if there are dates, which isn't today's date.
file:
date example text
20140714 <= not today's date
20140715 <= not today's date
20140716 <= today's date
my idea is to use Perderabo's datecalc
... (2 Replies)
Discussion started by: bora99
2 Replies
LEARN ABOUT HPUX
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)