01-13-2012
reading file paths from a text file
Hello all,
I am new to scripting and here is what I want to get done.
I need to run some processing on many files. I have a whole bunch of files among which there are a few that I am interested in. What I need to do is to write a script which reads the file paths from a text file. line by line in a loop and passes that path to the next command in my script which runs the selection criteria as to whether this is a file I want or not. How do I do this? i.e.
1) read the path from the text file in a loop and
2) pass the value read to the next command in my script?
Pls help.. Thanks in advance
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LEARN ABOUT XFREE86
ppmquantall
ppmquantall(1) General Commands Manual ppmquantall(1)
NAME
ppmquantall - run ppmquant on a bunch of files all at once, so they share a common colormap
SYNOPSIS
ppmquantall [-ext extension] ncolors ppmfile ...
DESCRIPTION
Takes a bunch of portable pixmap as input. Chooses ncolors colors to best represent all of the images, maps the existing colors to the new
ones, and overwrites the input files with the new quantized versions.
If you don't want to overwrite your input files, use the -ext option. The output files are then named the same as the input files, plus a
period and the extension text you specify.
Verbose explanation: Let's say you've got a dozen pixmaps that you want to display on the screen all at the same time. Your screen can
only display 256 different colors, but the pixmaps have a total of a thousand or so different colors. For a single pixmap you solve this
problem with ppmquant; this script solves it for multiple pixmaps. All it does is concatenate them together into one big pixmap, run
ppmquant on that, and then split it up into little pixmaps again.
(Note that another way to solve this problem is to pre-select a set of colors and then use ppmquant's -map option to separately quantize
each pixmap to that set.)
SEE ALSO
ppmquant(1), ppm(5)
AUTHOR
Copyright (C) 1991 by Jef Poskanzer.
27 July 1990 ppmquantall(1)