12-22-2011
Hi,
vivek d r, I actually didn't make an script. I just ran whole script from command line, preceded by time, ie:
Quote:
time cat $file | while read line; do grup=`echo "$line" | cut -d " " -f3`; if [ "$grup" == "27" ]; then exp=`echo "$line" | cut -d " " -f2`; echo $exp; fi; done;
rbatte1, I undestand that you recommend me to learn awk for scripting?
I ran command
Franklin52 said (using awk), and results where awesome.
Quote:
real 0m0.285s
user 0m0.030s
sys 0m0.062s
And using redirect (while.... < $file) results were also very good:
Quote:
real 0m0.429s
user 0m0.139s
sys 0m0.155s
Why is there so much difference in performance using redirect rather than using pipes as I did? Could be because using redirection whole script runs in one shell, while using pipes (cat $file | while...) use several shells?
And even more, why awk (which is a program) has better performance than bash built-in commands?
Thank you very much for all answers, they help me a lot. And sorry for my English
Albert.
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LEARN ABOUT ULTRIX
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)
NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO
ppm(5)
AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)