07-10-2009
for loop
Hi, I was wondering if anybody can help me with the following script problem:
I need to execute a command on two sets of 23 files. The command needs 4 input files: two of them will be the same for all 23 files (stable_1 and stable_2) and another two are varying from 1 to 23. The varying input files are of two types with names like 1to23_step.extention1 and 1to23_step.extenstion2
I've tried the following script:
for i in *_step.extention1
do
./executable -o stable_1 -p stable_2 -i $i_step.extension1 -v $i_step.extension2 > $i_output
done
Here's the problem:
line 1: $i_right: ambiguous redirect
Any help will be greatly appretiated! Many thanks in advance!
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LEARN ABOUT HPUX
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)